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Atoms Review

Terms in this set (12)

Electron
A subatomic particle that has a negative charge
Proton
positively charged particle
Neutron
subatomic particle with no charge
Nucleus
Center of an atom
energy levels (shells)
surround the nucleus and contain electrons (nucleus- protons and neutrons, 1st level- 2 electrons, 2nd level- 8 electrons, 3rd level- 8 electrons
If sodium has an atomic mass of 23 and an atomic number of 11, how many neutrons does it have?
12
If silicon has 14 protons and 14 neutrons, what is it's atomic mass number?
28
If calcium has an atomic mass of 40 and it has an atomic number of 20, how many neutrons does it have?
20
If aluminum has a mass number of 27 and has 13 protons, how many neutrons does it have?
14
If lithium has an atomic number of 3 and a mass number of 7, how many neutrons does it have?
4
If beryllium has a mass number of 9 and has 5 neutrons, how many protons does it have?
4
Which subatomic particle identifies the element?
number of protons (atomic number)
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