What is the centre of an atom called?

• nucleus

• core

• atomic centre

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NGSS.HS-PS1-8

Which two sub-atomic particles are in the nucleus of an atom?

• protons

• electrons

• neutrons

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NGSS.HS-PS1-8

Why does an atom have no overall charge?

• An atom has an equal number of positive electrons and negative protons.

• An atom has an equal number of positive protons and negative electrons.

• There are no charged sub-atomic particles in an atom to give it an overall charge.

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NGSS.MS-PS1-1

Which piece of information from the periodic table can you use to work out the number of electrons in an atom?

• relative atomic mass

• atomic symbol

• element name

• atomic (proton) number

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NGSS.HS-PS1-1

How many electrons are there in a sodium atom?

• 11

• 23

• 12

• 34

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NGSS.HS-PS1-1

How many electrons are there in a phosphorus atom?

• 15

• 31

• 16

• 47

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NGSS.HS-PS1-1

How many electrons are there in the lowest energy level (first shell) of a sodium atom?

• 2

• 8

• 11

• 1

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NGSS.MS-PS1-1

How many electrons are there in the second energy level (second shell) of an aluminium atom?

• 13

• 2

• 3

• 8

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NGSS.HS-PS1-1

There are 8 electrons in the second energy level of an argon atom. How many electrons are there in the third energy level (third shell) of an argon atom?

• 12

• 8

• 2

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NGSS.HS-PS1-1

True of false?

The electrons in an atom occupy the lowest available energy level.

• true

• false

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NGSS.HS-PS1-1