Atoms, Elements, Molecules, and Compounds.

Question 1

Atom.

Answer 1

The smallest particle of an element that can exist.

Question 2

Element.

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

Molecule.

Answer 3

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

Question 4

Compound.

Answer 4

A substance made of atoms from two or more elements.

Question 4

Proton.

Answer 4

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

Question 5

Neutron.

Answer 5

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

Question 6

Electron.

Answer 6

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

Question 7

Atomic Number.

Answer 7

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

Question 8

Mass Number.

Answer 8

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

Question 9

Chemical Symbol.

Answer 9

A one or two letter representation of an element.

Question 10

Subscript.

Answer 10

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