valence electrons, Lewis dot structures and oxidation number

This is a Bohr Diagram of Aluminum. How many valence electrons does Aluminum have?

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

How many valence electrons does Tin (Sn) have?

• 8

• 7

• 5

• 4

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NGSS.MS-PS1-1

How many valence electrons does Lithium (Li) have?

• 8

• 1

• 5

• 2

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NGSS.MS-PS1-1

How many valence electrons does Bromine (Br) have?

• 5

• 6

• 7

• 8

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NGSS.MS-PS1-1

Valence electrons are: 

• Electrons farthest away from the nucleus
• Electrons closest to the nucleus
• Electrons that just come and go - they don't stay with the atom
• Electrons in the second shell

Tags

NGSS.MS-PS1-1

How many electrons can the first shell hold?

• 2

• 4

• 6

• 8

What happens when the sodium atom loses an electron?

• It become negatively charged 
• It become positively charged
• none

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following has a full valence shell?

• Oxygen
• Neon
• Barium
• Carbon

Tags

NGSS.HS-PS1-1

If an atom loses two electrons what charge will it have?

• + 2
•  - 2
• +1
• -1

Tags

NGSS.HS-PS1-7

What is a valence electron?

• an electron that is found in the outermost shell of an atom. 
• an electron found in the innermost shell of an atom.
• an electron found in the middle shell.

Tags

NGSS.MS-PS1-1