Mass Number, Atomic Number, Isotopes and Ions

Positive ions form when atoms _________ valence electrons.

• lose
• gain
• share
• gain or share

What charge does an atom have if it LOSES an electron? 

• Positive (+)
• Negative (-)

When an atom LOSES an electron it is a

• cation
• anion

Ions are: 

• atoms with a positive or negative charge
• atoms with no charge
• atoms with ONLY a positive charge
• atoms with ONLY a negative charge

A negative ion is a 

• cation
• anion

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

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What charge does an atom have if it GAINS an electrons?

• Positive (+)
• Negative (-)

What is the number of neutrons?

• 34
• 79
• 45
• 35

Tags

NGSS.HS-PS1-8

If you have 10 protons and 9 neutrons, what would the mass number be?

• 19
• 9
• 10
• 1

What is the definition of isotope?

• atoms of an element with different numbers of neutrons.
• materials break down over time at a very consistent rate

Tags

NGSS.HS-PS1-8