periodic table of elements

How many energy levels does an atom's electrons have?

• 5

• 6

• 7

• 8

determine the location of this element

• Fifth row and first column

• Fourth row and first column

• The second row and the second column

• Fourth row and second column

A chemical element located in the third row and third column

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• 
• 

Tags

NGSS.MS-PS1-1

The number of chemical elements discovered so far

• 116

• 217

• 181

• 118

Tags

NGSS.HS-PS1-1

How many electrons does this element have indicated in the shown image

• 14

• 15

• 16

• 17

Tags

NGSS.MS-PS1-1

colorless gas;21% of air, H2O,65% of the body, organic molecules, blood, breathing, fire, half of Earth's crust

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• 
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• 

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

As you move left to right on a row or period what happens?

• Atomic number increases by 1

• Electrons decrease

• Number of shells decrease

• Nothing

The first energy shell can hold ______ electrons.

• 2

• 8

• 18

All elements in the same row have the same number of shells.

• True

• False

• Sometimes

What does the atomic number tell you?

• Number of Protons
• Number of Neutrons
• Sum of protons and neutrons