The force that holds atoms together is known as:

• centripetal force

• gravity

• chemical bond

• chemical reaction

Metals are located ______ of the periodic table.

• on the right side

• on the left side

• on the left side and the middle

• on the bottom and right side

Electrons with the greatest amount of energy are located:

• further from the nucleus

• closest to the nucleus

• in the first energy level

• in the nucleus

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NGSS.HS-PS1-1

Which does NOT describe a valence electron?

• electrons with the less amount of energy

• electrons that participate in chemical bonding

• electrons in the outermost energy level

• electrons that have the most energy

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NGSS.HS-PS1-1

Which of the following elements is the most stable?

• Neon

• Fluorine

• Calcium

• Sodium

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Which elements are the most stable?

• Halogens - Group 17

• Noble gases - Group 18

• Alkali metals - Group 1

• Alkaline earth metals - Group 2

How many valence electrons do halogens have?

• 1

• 2

• 7

• 8

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NGSS.HS-PS1-1

How many electrons can the first energy level hold?

• 1

• 2

• 8

• 10

How many electrons can the second energy level hold?

• 1

• 2

• 8

• 10

What characterizes a stable atom? (choose all that apply)

• atoms with all paired electrons

• atoms with a full outermost energy level

• atoms that have at least 1 unpaired electron

• atoms that have 2 unpaired electrons

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NGSS.HS-PS1-1