Unit 1 Atomic Structure & Light Review

The nucleus of an atom contains which subatomic particles?

• protons and electrons

• protons and neutrons

• electrons and neutrons

• protons, electrons, and neutrons

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Which subatomic particle is counted to determine the type of element the atom represents?

• proton

• neutron

• electron

• boron

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Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

Adding or subtracting neutrons (charge = 0, mass = 1) makes the element change into an...

• ion
• mixture
• isotope
• neutral atom

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The atomic mass is equal to _.

• the number of protons only
• the number of neutrons only
• the total number of protons and neutrons
• the number of protons, neutrons, and electrons.

An atom becomes _________ when it gains electrons.

• Positive
• Negative
• Neutral
• Invinsible

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An atom that has gained or lost electrons is called ...

• a winner
• an isotope
• an ion
• a loser

When an atom loses an electron, it becomes a

• positive ion

• negative ion

• neutral ion

• neutral atom

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What property determines if an atom is identified as Flourine?

• it has 10 neutrons

• it has an atomic mass of 19

• it has 9 protons

• Its element symbol is Fl.

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Which element is shown in the Bohr model?

• Helium because it has 2 valence electrons

• Magnesium because it has an atomic number of 12.

• Chromium because is has an atomic mass of 24.

• Argon because it has 18 total subatomic particles.

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