Check Your Knowledge

What is the smallest particle of matter?

• atom

• cell

• ion

• molecule

Which is a negatively charged particle?

• electron

• ion

• neutron

• proton

What element is this?

Au

• aluminum

• gold

• silver

• uranium

What makes an element?

• atom

• cell

• molecule

• substance

What is shown in the image?

• a molecule

• an atom

• an element

• an ion

What is the chemical symbol for mercury?

• Er

• Hg

• Mg

• Mn

What is the smallest particle of a compound?

• cell

• matter

• molecule

• substance

What is said to be the center of an atom?

• core

• nucleus

• neutron

• quantum particle

Which of the following element is a gas?

• carbon

• chlorine

• iron

• mercuryy

What will happen to the charged particles in the picture?

• They will not move.

• They will repel each other.

• They will attract each other.

• They will move around each other.