Electron Structure

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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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.

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

NGSS.HS-PS1-2

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.HS-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