Atomic Numbers Review
1.
Isotope
Mass number
Atomic number
Protons
lead-_____
Neutrons
Electrons
127
1.
The blanks, respectively, would be filled: 209, 209, 82, 82, 82
2.
The blanks, respectively, would be filled: 82, 127, 209, 127, 127
3.
The blanks, respectively, would be filled: 209, 127, 82, 82, 82
4.
The blanks, respectively, would be filled: 127, 209, 127, 82, 82
2. Which of the following accurately summarizes the isotope Helium-3?
1.
2 protons, 2 electrons, 1 neutron
2.
4 protons, 4 electrons, 0 neutrons
3.
3 protons, 1 electrons, 0 neutrons
4.
3 protons, 3 electrons, 0 neutrons
3. All atoms of the same element share the following in common:
the same number of protons
the same atomic number
the same number of electrons
the same number of neutrons
the same mass number
4. 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
5. How many electrons would be found in an atom of oxygen (atomic number 8)?
1.
8
2.
6
3.
4
4.
2
6. In order for an atom to be nitrogen, it must have:
7 protons
a mass of 14.01
7 neutrons
an atomic number of 7
7. Which of the following accurately summarizes the isotope Argon-40?
1.
39.95 protons, 39.95 electrons, 21.05 neutrons
2.
40 protons, 40 electrons, 18 neutrons
3.
18 protons, 18 electrons, 22 neutrons
4.
22 protons, 22 electrons, 18 neutrons
8. How many neutrons are there in an atom of hydrogen-3?
1.
1
2.
2
3.
3
4.
0
9. 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 a larger electron cloud than uranium-235
3.
Uranium-238 has three more protons than uranium-235
4.
Uranium-238 has three more neutrons than uranium-235
10. The atomic number of an element is equal to:
1.
the number of protons plus the number of neutrons
2.
the number of protons plus the number of electrons
3.
the number of protons in the atom
4.
the number of neutrons in the atom
11. How many electrons, neutrons and protons would be found in an atom of carbon-14
(atomic number 6)?
1.
8 electrons, 8 neutrons, 6 protons
2.
6 electrons, 6 neutrons, 6 protons
3.
6 electrons, 6 neutrons, 8 protons
4.
6 electrons, 8 neutrons, 6 protons
12.
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: 24, 21, 45, 21, 21
3.
The blanks, respectively, would be filled: 45, 21, 21, 24, 21
4.
The blanks, respectively, would be filled: 21, 45, 24, 21, 21
13.
Isotope
Mass number Atomic number Protons Neutrons Electrons
_______________-27
1.
The blanks, respectively, would be filled: cobalt, 40, 27, 13, 27
2.
The blanks, respectively, would be filled: silicon, 27, 14, 13, 13
3.
The blanks, respectively, would be filled: aluminum, 27, 13, 13, 14
4.
The blanks, respectively, would be filled: aluminum, 27, 13, 14, 13
14. Most of the mass of the atom can be found in the:
1.
electron cloud
2.
nucleus
3.
electrons
4.
charges
15. The mass number of an atom is determined by:
1.
adding the neutrons and electrons
2.
adding the neutrons and protons
3.
the number of protons only
4.
adding the protons and electrons
13