WorksheetsPS 4.2 Formative
Total questions: 10
Worksheet time: 8mins
A (a) is a subatomic particle with a positive charge.
The (a) number of an element equals the number of protons in an atom of that element.
The (a) number of an atom is the sum of the protons and neutrons in the nucleus of that atom.
_____ of an element have the same atomic number but a different number of neutrons.
atoms
compounds
isotopes
molecules
The (a) is the subatomic particle with the smallest mass.
An atom of aluminum has 13 protons and 14 neutrons. What is the mass number of the atom?
13
14
27
28
An atom of sulfur has 16 protons. If the mass number of the atom is 33, what is the atomic number?
16
32
17
23
A (a) is a neutral subatomic particle that has a mass almost exactly the same as a proton.
An atom of oxygen has 8 protons. If the mass number of the atom is 18, how many neutrons does it have?
8
18
10
16
All oxygen atoms contain 8 protons. How many neutrons does the isotope oxygen-17 contain?
(a)
