Most metals are (a)_____ solids that can be (b)_____ and (c)_____.

(a)- shiny

(b)- stretched

(c)- shaped

(a)- electricity

(b)- heat

Nonmetals may be (a)_____, (b)_____, or a (c)_____.

(a)- solid

(b)- liquid

(c)- gas

(a)_____ _____ are typically dull and brittle.

(a)- Solid minerals

Metalloids are also called (a)_____. 

(a)- semiconductors

Sodium must be stored in oil because otherwise, it reacts (a)_____ with O₂. It is very reactive because it only has (b)_ valence electron.

(a)- violently

(b)- 1

Alkaline earth metals, group (a)_, have (b)_ valence electrons.

(a)- 2

(b)- 2

Hard shells of many sea animals are made of the element (a)_____. Once these shells break down they become (b)_____ or (c)_____. Coral is one type of (d)_____ structure.

(a)- calcium

(b)- limestone

(c)- marble

(d)- limestone

Most (a)_____ metals are found combined with other elements as an (b)_____. But the element (c)_____ is found to be an exception.

(a)- transition

(b)- ore

(c)- gold

Doctors are able to study the human brain by using technetium-99 isotope because it is (a)_____.

(a)- radioactive

Carbon is typically found as a (a)_____ or (b)_____, but a third form called (c)_____ was confirmed in 1990.

(a)- graphite

(b)- diamond

(c)- fullerenes 

Nonmetals and their (a)_____ are plentiful on earth.

(a)- compound

The  most plentiful gases in the air are (a)_____ and (b)_____.

(a)- nitrogen

(b)- oxygen

(a)_____ is known for its terrible smell.

(a)- Sulfur

Chlorine and other (a)_____ are located in Group 17.

(a)- halogens

(a)_____ and (b)_____ bond together to make table salt.

(a)- Sodium

(b)- chloride

(a)_____ is added to some water supplies and toothpaste to prevent tooth decay.

(a)- Flourine

Halogens are highly reactive because the contain only (a)_ valence electron(s). (b)_ more electron is needed for halogen to contain a full outer shell.

(a)- 7

(b)- 1

Noble gases are inert because their (a)_____ _____ is full. They also do not join with (b)_____ atoms to form (c)_____ under normal conditions.

(a)- outer shell

(b)- other

(c)- compounds