Unit 3 Lesson 4

Question 1

Ion

Answer 1

A particle with a positive or negative charge

Forms when an atom gains or loses electrons from the outermost energy level
(The # of protons does not change)

Question 2

Positive ion

Negative ion

Answer 2

Has more protons than electrons (loses electrons)

Has more electrons than protons (gains electrons)

Question 3

Ionic bond

Answer 3

A force that brings oppositely charged ions together

Electrons are transferred from a metal to a nonmetal

Question 4

Covalent bonds

Answer 4

Forms when atoms share valence electrons

The shared electrons fill empty spaces in the outermost energy level

Question 5

Molecule

Covalent compounds

Answer 5

A group of atoms held together by chemical bonds

Molecules that contain atoms of more than 1 element

Question 6

Metallic bond

Answer 6

Forms between metal atoms when their outermost energy levels overlap

Electrons move freely in a sea or cloud of electrons

Question 7

Comparison

Answer 7

Ionic Bonds Covalent Bonds Metallic Bonds

B/w metal and NM. B/w nonmetals. Between metals
Soluble in water. Low solubility in water. Not soluble in water
High melting point. Low melting point
High boiling point. Low boiling point
Poor conductors. Do not conduct electricity. Good conductors
Form compounds. Form molecules. Weakest bonds
Brittle. Malleable and ductile