Atoms, Elements, Molecules, and Compounds

Question 1

Atom

Answer 1

The smallest particle of an element that can exist

Question 2

Elements

Answer 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 examples.

Question 3

Molecules

Answer 3

The smallest particles of a substance that can exist. It is compounded of two more atoms.

Question 4

Compounds

Answer 4

A substance made of atoms from two or more elements

Question 5

Proton

Answer 5

A particle or matter that has a positive electrical charge and found in the nucleus of an atom

Question 6

Neutron

Answer 6

A particle or matter that has no electrical charge and found in the nucleus of an atom

Question 7

Electron

Answer 7

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

Question 8

Atomic Number

Answer 8

= the number of protons in an element’s atoms. Top number in the elements box.

Question 9

Mass Number

Answer 9

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

Question 10

Subscript

Answer 10

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

Question 11

Chemical Symbol

Answer 11

A one or two letter representation of an element