Atomic Numbers Review

The mass number of an atom is determined by:
1. adding the protons and electrons
2. adding the neutrons and electrons
3. adding the neutrons and protons
4. the number of protons only
How many electrons, neutrons and protons would be found in an atom of carbon-14 (atomic number 6)?
1. 6 electrons, 6 neutrons, 6 protons
2. 6 electrons, 6 neutrons, 8 protons
3. 8 electrons, 8 neutrons, 6 protons
4. 6 electrons, 8 neutrons, 6 protons
How many electrons would be found in an atom of oxygen (atomic number 8)?
1. 2
2. 4
3. 6
4. 8
The atomic number of an element is equal to:
1. the number of protons in the atom
2. the number of neutrons in the atom
3. the number of protons plus the number of neutrons
4. the number of protons plus the number of electrons
An element with nine protons in every atom must:
1. have nine neutrons as well
2. be fluorine
3. have a mass number of nine
4. be unstable
Most of the mass of the atom can be found in the:
1. electron cloud
2. nucleus
3. electrons
4. charges
How many neutrons are there in an atom of hydrogen-3?
1. 0
2. 1
3. 2
4. 3
Isotope Mass number Atomic number Protons Neutrons Electrons
Scandium-45
1. The blanks, respectively, would be filled: 21, 45, 21, 21, 24
2. The blanks, respectively, would be filled: 45, 21, 21, 24, 21
3. The blanks, respectively, would be filled: 21, 45, 24, 21, 21
4. The blanks, respectively, would be filled: 24, 21, 45, 21, 21
Isotope Mass number Atomic number Protons Neutrons Electrons
_______________-27 13
1. The blanks, respectively, would be filled: aluminum, 27, 13, 13, 14
2. The blanks, respectively, would be filled: cobalt, 40, 27, 13, 27
3. The blanks, respectively, would be filled: aluminum, 27, 13, 14, 13
4. The blanks, respectively, would be filled: silicon, 27, 14, 13, 13
Isotope Mass number Atomic number Protons Neutrons Electrons
lead-_____ 127
1. The blanks, respectively, would be filled: 209, 209, 82, 82, 82
2. The blanks, respectively, would be filled: 127, 209, 127, 82, 82
3. The blanks, respectively, would be filled: 209, 127, 82, 82, 82
4. The blanks, respectively, would be filled: 82, 127, 209, 127, 127
Which of the following accurately summarizes the isotope Helium-3?
1. 2 protons, 2 electrons, 1 neutron
2. 3 protons, 3 electrons, 0 neutrons
3. 3 protons, 1 electrons, 0 neutrons
4. 4 protons, 4 electrons, 0 neutrons
Which of the following accurately summarizes the isotope Argon-40?
1. 18 protons, 18 electrons, 22 neutrons
2. 40 protons, 40 electrons, 18 neutrons
3. 22 protons, 22 electrons, 18 neutrons
4. 39.95 protons, 39.95 electrons, 21.05 neutrons
All atoms of the same element share the following in common:
1. the same number of protons
2. the same number of electrons
3. the same atomic number
4. the same number of neutrons
5. the same mass number
In order for an atom to be nitrogen, it must have:
1. a mass of 14.01
2. 7 protons
3. 7 neutrons
4. an atomic number of 7
An atom of uranium-238 differs from an atom of uranium-235 in the following way:
1. Uranium-238 has three more electrons than uranium-235
2. Uranium-238 has three more protons than uranium-235
3. Uranium-238 has three more neutrons than uranium-235
4. Uranium-238 has a larger electron cloud than uranium-235

Isotope	Mass number	Atomic number	Protons	Neutrons	Electrons
Scandium-45