practice for test- CP

Why do all bonds form?

• to fill the outermost energy level

• so an atom can be unstable

• so the number of protons and electrons can equal.

• so they can gain neutrons.

Valence electrons are found

• outermost energy level

• innermost energy level

• some where in the electron cloud

An atom with 1 valence electron 'needs' a full shell, so it can either gain 7 electrons or lose 1. Which is more likely to occur?

• nothing

• gain 7

• lose 1

How do covalent bonds form?

• by sharing electrons between atoms

• by donating or receiving electrons

What two types of atoms make a covalent bond?

• 2 nonmetals

• 2 metals

• 1 metal and 1 nonmetal`

How many valence electrons does Boron have?

• 1

• 2

• 3

• 4

When an atom loses an electron, it becomes a

• positive ion

• negative ion

Ionic bonds are between

• metals and nonmetals

• 2 metals

• 2 nonmetals

Atoms are most stable when their outer shell is full or complete.

• true

• false

How are ionic bonds formed?

• transfer of electrons

• sharing of electrons