1 Bohr & Ions recap

Valence electrons are: 

• Electrons farthest away from the nucleus
• Electrons closest to the nucleus
• Electrons that just come and go - they don't stay with the atom

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Ions are: 

• atoms with a positive or negative charge
• atoms with no charge
• atoms with ONLY a positive charge
• atoms with ONLY a negative charge

When an atom loses a valence electron, it becomes a(n) _____________ ion.

• positive
• negative
• neutral
• polyatomic

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Negative ions form when atoms _________ valence electrons.

• lose
• gain
• share

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an atom with atomic number 6 would have how many protons 

• 6
• 12
• 3
• cannot be determined 

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If an atom has a charge of +2 it has

• gained 2 electrons

• lost 2 electrons

• gained 2 protons

• lost 2 protons

If an atom has a charge of -3 it has

• gained 3 electrons

• lost 3 electrons

• gained 3 protons

• lost 3 protons

How many protons and electrons does an ATOM of Nitrogen have?

• 7 protons and 8 electrons

• 7 protons and 7 electrons

• 11 protons and 11 electrons

• 11 protons and 23 electrons

Answer explanation

Remember the word ATOM implies that it is neutral

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Atoms of Potassium like to lose one electron to become more stable. What will the charge of this new potassium ion be?

• +1

• +2

• -1

• -2

Answer explanation

Losing electrons leads to a positive charge.

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Fluorine atoms like to GAIN 1 electron to become more stable. What will the charge be of this new fluorine ion?

• -1

• +1

• 0

• -2

Answer explanation

Gaining electrons --> negative charge

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