How many outer (valence) electrons are in an atom of Se?

• 2

• 8

• 6

• 5

Tags

NGSS.HS-PS1-1

How many outer (valence) electrons are in an atom of Ar?

• 2

• 8

• 4

• 1

How many outer (valence) electrons are in an atom of K?

• 3

• 8

• 4

• 1

How many outer (valence) electrons are found in atoms of group 1?

• 7

• 6

• 4

• 1

How many valence (outer) electrons does an Oxygen atom have?

• 2

• 6

• 8

• 16

Tags

NGSS.HS-PS1-1

What is the atomic number of this element?

• 17

• 18

• 35

• 35.453

Tags

NGSS.HS-PS1-1

How many electrons does an atom with 8 protons have?

• 8
• 16
• 15.99
• 24

Tags

NGSS.HS-PS1-1

What group does this element belong to?

• Group 1: Alkali metals
• Group 18: Noble Gases
• Group 2: Alkaline-Earth Metals
• Group 17: Halogens

Tags

NGSS.HS-PS1-1

What is the 0xidation number (charge) on an Aluminum ion?

• 3

• +3

• +2

• +1

Tags

NGSS.HS-PS1-1

Fe ⁺³  and  S ^-2

• Fe₃S₂
• FeS
• S₃Fe₂
• Fe₂S₃

Tags

NGSS.MS-PS1-1