Atomic Structure

A proton has an electrical charge of A) 0 B) -1 C) +1 D) -2 E) +2

+1

How many protons are in an isotope of sodium with a mass number of 25? A) 11 B) 14 C) 15 D) 25 E) 36

11

The number of electrons in an ion with 16 protons and an ionic charge of 2⁻ is A) 16 B) 2 C) 22 D) 18 E) 14

18

The atomic number of iron is A) 26 B) 55.85 C) 29.85 D) 56 E) 27.78

26

The Fe³⁺ ion has A) 26 protons and 26 electrons B) 56 protons and 53 electrons C) 23 protons and 26 electrons D) 26 protons and 23 electrons E) 23 protons and 23 electrons

26 protons and 23 electrons

What is the ionic charge of an ion with 13 protons and 10 electrons? A) 1+ B) 2+ C) 3+ D) 2- E) 3-

3+

Consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the element is A) 30 B) 32 C) 34 D) 64 E) 94

30

Consider a neutral atom with 30 protons and 34 neutrons. The number of electrons in this atom is A) 30 B) 32 C) 34 D) 64 E) 94

30

All bromine atoms have ________ electrons in their nucleus.

35

Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of ¹¹⁸Sn₅₀? A) 118 protons, 50 neutrons, 118 electrons B) 118 protons, 118 neutrons, 50 electrons C) 50 protons, 68 neutrons, 50 electrons D) 68 protons, 68 neutrons, 50 electrons E) 50 protons, 50 neutrons, 50 electrons

50 protons, 68 neutrons, 50 electrons

All carbon atoms have ________ protons in their nucleus.

6

The atomic mass of lithium is A) 7.000 amu B) 3.000 amu C) 4.000 amu D) 6.941 amu E) 7.413 amu

6.941 amu

Consider a neutral atom with 30 protons and 34 neutrons. The mass number for this atom is A) 30 B) 32 C) 34 D) 64 E) 94

64

The number of elements that occur in nature is

88

The atomic number of fluorine is A) 28 B) 19 C) 9 D) 10 E) 29

9

The lightest of the subatomic particles is the A) neutron B) electron C) nucleus D) proton E) atom

B

A neutron has an electrical charge of A) 0 B) -1 C) +1 D) -2 E) +2

0

The primary substances of which all other substances are composed are A) molecules B) compounds C) elements D) electrons E) protons

elements

The number of neutrons in an atom is equal to the A) atomic number B) mass number C) mass number + the atomic number D) mass number - the atomic number E) number of protons

mass number - the atomic number

Protons and neutrons are found in the ________ of the atom.

nucleus

The mass number of an atom can be calculated from the A) number of electrons B) number of protons plus neutrons C) number of protons D) number of electrons plus protons E) number of neutrons

number of protons plus neutrons

The atomic number of an atom is equal to the number of A) nuclei B) neutrons C) neutrons plus protons D) electrons plus protons E) protons

protons

Which of the following descriptions of a subatomic particle is correct? A) A proton has a positive charge and a mass of approximately 1 amu. B) An electron has a negative charge and a mass of approximately 1 amu. C) A neutron has no charge and its mass is negligible. D) A proton has a positive charge and a negligible mass. E) A neutron has a positive charge and a mass of approximately 1 amu.

A proton has a positive charge and a mass of approximately 1 amu.

True or False Electrons have an electrical charge of +1

False

True or False The atomic number of magnesium is 24.

False

Which of the following is true about the proton? A) It has a charge of -1 and is in the nucleus of the atom. B) It has a charge of +1 and is in the nucleus of the atom. C) It has a charge of 0 and is in the nucleus of the atom. D) It has a charge of -1 and is not in the nucleus of the atom. E) It has a charge of +1 and is not in the nucleus of the atom.

It has a charge of +1 and is in the nucleus of the atom.

True or False Neutrons are found in the nucleus of the atom.

True

True or False Protons are found in the nucleus of the atom.

True

True or False The atomic number of chromium is 24.

True

The atomic mass of an element is equal to A) its mass number B) its atomic number C) one-twelfth of the mass of a carbon-12 atom D) a weighted average mass of all of the naturally occurring isotopes of the element E) the average mass of all of the naturally occurring isotopes of the element

a weighted average mass of all of the naturally occurring isotopes of the element

The atomic number of an element is found ________ the symbol.

above

In an atom, the nucleus contains A) an equal number of protons and electrons B) all the protons and neutrons C) all the protons and electrons D) only neutrons E) only protons

all the protons and neutrons

The smallest particle of an element that retains the characteristics of the element is a(n) A) electron B) neutron C) proton D) atom E) nucleus

atom

According to the Atomic Theory, A) all atoms are different B) atoms are created and destroyed during a chemical reaction C) atoms of different elements combine to form compounds D) all matter is made up of tiny particles called electrons E) a compound can contain different numbers of atoms as long as it has the same kinds of atoms

atoms of different elements combine to form compounds

The Rutherford gold foil experiment demonstrated that atoms A) consist of an almost empty nucleus surrounded by a dense cloud of electrons B) are homogeneous C) are visible to the naked eye D) consist of a dense nucleus surrounded by mostly empty space E) consist of a single type of subatomic particle

consist of a dense nucleus surrounded by mostly empty space

Electrons are found in the ________ of the atom.

electron cloud (or outer part)

A sample of matter that consists of only one type of atom is classified as a(n)

element