Valence Electrons and Ions

Valence electrons are found

• in the innermost energy level of an atom

• in the middle energy levels of an atom

• in the outermost energy levels of an atom

How many valence electrons does hydrogen have?

• 1

• 2

• 3

• 4

When an atom loses an electron, it becomes a

• positive ion

• negative ion

• neutral ion

• neutral atom

How are ionic bonds formed?

• Transfer of electrons

• Sharing of electrons

Atoms that gain electrons become...

• negatively charged

• positively charged

• remain neutrally charged

• 21

How many valence electrons does calcium have?

• 2

• 4

• 6

• 7

An atom that has gained or lost electrons is called ...

• a winner

• an isotope

• an ion

• a loser

What type of elements form cations?

• metals

• nonmetals

• metalloids?

Tags

NGSS.MS-PS1-1

Anions

• Gain electrons, has an overall positive charge

• Lose electrons, has an overall positive charge

• Lose electrons, has an overall negative charge

• Gain electrons, has an overall negative charge

Why do all bonds form?

• so the number of protons equals the number of electrons

• so an atom can become unstable

• to fill the outermost energy level