How many neutrons does the isotope below have?     ⁸⁹ ₃₆Kr

• 53
• 36
• 89
• 125

Tags

NGSS.HS-PS1-8

Which is most likely to form a negative ion?

• an element from group 17
• a metal
• an element from group 1
• an element with atoms that have eight valence electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When an atom loses a valence electron, it becomes a(n) _____________ ion.

• positive
• negative
• neutral
• polyatomic

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many electrons does O^-2 (oxide ion) have?

• 8
• 10
• 6
• 18

Tags

NGSS.HS-PS1-1

How many electrons does Mg⁺² (magnesium ion) have?

• 10
• 12
• 14
• 22

An atom of which element is represented in the following Bohr model?

• K

• Na

• Li

• Cl

Tags

NGSS.HS-PS1-1

How many valence electrons does a neutral atom of sulfur contain?

• 1

• 4

• 6

• 8

Tags

NGSS.HS-PS1-1

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0

• 2
• 6
• 10
• 16

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2