Atomic Structure and the Periodic Table

• A

• B

• C

• D

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NGSS.MS-PS1-1

• F

• G

• H

• J

How many valence electrons are in an atom of each element in Group 15 in the periodic table?

• 5

• 10

• 15

• 20

• Neon, because it has two energy levels with eight electrons in the second level

• Chlorine, because it has three energy levels with seven electrons in the third level

• Gallium, because it has four energy levels with three electrons in the fourth level

• Tin, because it has five energy levels with four electrons in the fifth level

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NGSS.MS-PS1-1

Which statement does NOT correctly compare silicon with another element?

• Silicon is a better conductor of electricity than sulfur.

• Silicon conducts electricity as well as copper does.

• Silicon is a solid at room temperature, but argon is a gas.

• Silicon is less malleable than silver.

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NGSS.HS-PS1-1

Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, a nonmetal, or a metalloid.

Which table was completed correctly?

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• 
• 
• 

The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table

shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

• Number of Particles

  Inside Nucleus 36

  Number of Particles

  Outside Nucleus 36

• Number of Particles

  Inside Nucleus 36

  Number of Particles

  Outside Nucleus 48

• Number of Particles

  Inside Nucleus 84

  Number of Particles

  Outside Nucleus 36

• Number of Particles

  Inside Nucleus 84

  Number of Particles

  Outside Nucleus 48

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NGSS.MS-PS1-1

• Particle X

• Particle Y

• Particle W

• Particle Z

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NGSS.MS-PS1-1

• 
• 
• 
• 

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NGSS.MS-PS1-1

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge.

• The electrons are outside the nucleus and have no charge.

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

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NGSS.MS-PS1-1