Chemistry Chapter 2

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). Typically, the mass number is written as a superscript in front of the elemental symbol. Which of the following pairs are isotopes of each other?

70 Ga and 69 Ga

An ion is a charged atom, due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. What symbol designates an ion that contains 30 protons and 28 electrons?

Zn 2+

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). Typically, the mass number is written as a superscript in front of the elemental symbol. Which of the following would be an isotope of tin-119?

120 Sn

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). The following designation—the atomic symbol—is used to represent different isotopes of an element: "A" is the mass number, "Z" is the atomic number, and "X" is the chemical symbol of the element. Select the atomic symbol that would represent an isotope with 56 protons and 82 neutrons.

138/56 Ba

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). How many protons are present in an element of argon?

18 Protons

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). The following designation—the atomic symbol—is used to represent different isotopes of an element: "A" is the mass number, "Z" is the atomic number, and "X" is the chemical symbol of the element. Select the atomic symbol that would represent an isotope with 13 protons and 14 neutrons.

27/13 Al

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). The mass number, which is typically written as a superscript in front of the elemental symbol, is the number of protons plus neutrons. Because the protons and neutrons are found in the nucleus, the mass number is also the mass of the nucleus. From the mass number and the atomic number, the number of neutrons can also be determined. How many neutrons are present in the following element of copper? 64Cu

35 Neutrons

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). The mass number, which is typically written as a superscript in front of the elemental symbol, is the number of protons plus neutrons. Because the protons and neutrons are found in the nucleus, the mass number is also the mass of the nucleus. From the mass number and the atomic number, the number of neutrons can also be determined. How many neutrons are present in the following element of bromine? 81Br

46

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). Typically, the mass number is written as a superscript in front of the elemental symbol. The following designation is used to distinguish different isotopes of an element from one another: "A" is the mass number, "Z" is the atomic number, and "X" is the chemical symbol of the element. What is the correct symbol for an ion containing 24 protons, 27 neutrons, and 21 electrons?

51/24 Cr3+

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). Typically, the mass number is written as a superscript in front of the elemental symbol. Which of the following would be an isotope of 58Ni?

60 Ni

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). Typically, the mass number is written as a superscript in front of the elemental symbol. The following designation is used to distinguish different isotopes of an element from one another: "A" is the mass number, "Z" is the atomic number, and "X" is the chemical symbol of the element. What is the correct symbol for an ion containing 34 protons, 44 neutrons, and 36 electrons?

78/34 Se 2-

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). The following designation—the atomic symbol—is used to represent different isotopes of an element: "A" is the mass number, "Z" is the atomic number, and "X" is the chemical symbol of the element. Consider the following designation for an isotope of potassium-40: What numbers should be used for the letter "A" and the letter "Z"? What symbol should be used for the letter "X"?

A - 40 Z - 19 X - K

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. Therefore, isotopes have the same atomic number (number of protons) but a different mass number (number of protons plus number of neutrons). Typically, the mass number is written as a superscript in front of the elemental symbol. The following designation is used to distinguish different isotopes of an element from one another: "A" is the mass number, "Z" is the atomic number, and "X" is the chemical symbol of the element. Consider the following designation for an isotope of phosphorus-31: What numbers should be used for the letter "A" and the letter "Z"?

A = 31, Z = 15

An ion is a charged atom, due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. What would be required for aluminum to form the ion Al3+?

Aluminum would lose three electrons.

An ion is a charged atom due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. Which atom has the same number of electrons as a P3- ion?

Ar

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). The mass number, which is typically written as a superscript in front of the elemental symbol, is the number of protons plus neutrons. From the mass number and the atomic number, the number of neutrons can be determined. In a neutral atom, the number of protons must be equal to the number of electrons, as the protons are positively charged and the electrons are negative charged. Which isotope has the same number of neutrons as Ca-42?

Ar-40

An ion is a charged atom due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. An ion has a 2+ charge and 18 electrons. What is the identity of the element?

Ca

An ion is a charged atom, due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. If calcium were to lose two electrons, what would be the resulting ion?

Ca2+

An ion is a charged atom, due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. What would be required for fluorine to form the ion F-?

Fluorine would gain one electron.

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). Which element has a total of 79 protons?

Gold, Au

Atoms contain a combination of protons, neutrons, and electrons which gives an atom its properties and makes it possible to predict their reactivity, including which ion(s) will form from that element. Of protons, neutrons, and electrons, which one(s) are found in the nucleus and which one(s) are found outside the nucleus?

Protons and neutrons are found in the nucleus, while electrons are found outside the nucleus.

An ion is a charged atom, due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. What would be required for magnesium to form the ion Mg2+?

Magnesium would lose two electrons.

An ion is a charged atom, due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. If nitrogen were to gain three electrons, what would be the resulting ion?

N3-

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). The mass number, which is typically written as a superscript in front of the elemental symbol, is the number of protons plus neutrons From the mass number and the atomic number, the number of neutrons can be determined. In a neutral atom, the number of protons must be equal to the number of electrons, as the protons are positively charged and the electrons are negative charged. Which isotope has the same number of neutrons as N-15?

O-16

An ion is a charged atom, due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. What symbol designates an ion that contains eight protons and 10 electrons?

O2-

An ion is a charged atom due to an unequal number of protons and electrons. If the number of protons is greater than the number of electrons, a positively charged ion, or cation, is formed. If the number of protons is less than the number of electrons, a negatively charged ion, or anion, is formed. Remember that the number of protons cannot be altered, as the number of protons determines the identity of an element. An ion has a 3- charge and 18 electrons. What is the identity of the element?

P

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). The mass number, which is typically written as a superscript in front of the elemental symbol, is the number of protons plus neutrons. Because the protons and neutrons are found in the nucleus, the mass number is also the mass of the nucleus. From the mass number and the atomic number, the number of neutrons can also be determined. In a neutral atom, the number of protons must be equal to the number of electrons, as the protons are positively charged and the electrons are negative charged. How many protons, neutrons, and electrons are present in the following element of neon? 22Ne

Protons: 10 Neutrons: 12 Electrons: 10

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). The mass number, which is typically written as a superscript in front of the elemental symbol, is the number of protons plus neutrons. Because the protons and neutrons are found in the nucleus, the mass number is also the mass of the nucleus. From the mass number and the atomic number, the number of neutrons can also be determined. How many protons and neutrons are present in the following element of iron? 56Fe

Protons: 26 Neutrons: 30

The atomic number, which is the number of protons, is used to identify an element. The atomic number is also used to organize the elements in the periodic table, as the elements are organized by increasing atomic number (or the increasing number of protons). In a neutral atom, the number of protons must be equal to the number of electrons, as the protons are positively charged and the electrons are negative charged. How many protons and electrons are present in an element of strontium?

Protons: 38 Electrons: 38