CHE 102: Chapter 3- Atoms and Elements
Which of these is the correct chemical symbol for potassium?
K
Which pair of elements do you expect to be most similar ?
O and S
Which of the following is true?
Oxygen and sulfur are in the same group
The elements of the group 7A will all form ions. These ions will be _____ and will have a charge of _____.
anions; 1−
The number of protons in a neutral atom is equal to the _____ of the atom.
atomic number
Nonmetals tend to _____ electrons to form _____ ions
gain; negative
What is the charge on an ion that contains 16 protons and 18 electrons?
−2
Determine the correct number of protons and electrons in P3−.
15 protons and 18 electrons
Chlorine has two isotopes, 35Cl and 37Cl, whose respective abundances are 75.77% and 24.23% and masses are 34.9688 amu and 36.9659 amu. Calculate the atomic mass of chlorine
35.45 amu
The correct symbol for the isotope of potassium with 22 neutrons is ________.
41 K 19
How many atoms does one mole of aluminum contain?
6.022x10^23
Which of these elements has three valence electrons?
Al
The elements Li, Na, K, Pb and Cs are the members of which group/ family?
Alkali metals
Which of these statements about atoms is incorrect?
Atoms are the smallest visible particles of an element.
Which of these is the correct chemical symbol for carbon?
C
Which of these particles has a negative charge?
Electron
Which of the following statements about electrons is incorrect?
Electrons exist in the nucleus of the atom
Which of these elements is a metal?
Mg
The most abundant element in the Earth's crust by mass is _____.
oxygen
Isotopes of an element have the same number of _____ but a different number of _____.
protons; neutrons