Atoms, Elements, Molecules, and Compounds

Question 1

The smallest particle of an element that can exist.

Answer 1

Atom

Question 2

A pure chemical substance that cannot be physically split into a more simple substance. Each is made of one type of atom. Carbon, mercury and hydrogen are all examples.

Answer 2

Element

Question 3

The smallest particle of a substance that can exist. It is composed of two or more atoms.

Answer 3

Molecule

Question 4

A substance made of atoms from two or more elements.

Answer 4

Compound

Question 5

A particle of matter that has a positive electrical charge and forms part of the nucleus of an atom.

Answer 5

Proton

Question 6

A particle of matter that has no electrical charge and forms part of the nucleus of an atom.

Answer 6

Neutron

Question 7

A particle of matter that has a negative electrical charge and travels around the nucleus of an atom.

Answer 7

Electron

Question 8

Number of protons. Top number in the element box.

Answer 8

Atomic Number

Question 9

Number of protons plus neutrons. Bottom number in the element box.

Answer 9

Mass Number

Question 10

A one or two letter representation of an element.

Answer 10

Chemical Symbol

Question 11

Tiny number to the right of the element symbol. Tells you how many atoms of that element.

Answer 11

Subscript