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Atom, Elements, Molecules, and Compounds

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Total cards: 11•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (11)

#1
Front (Question)

Atom

Back (Answer)

The smallest particle of an element that can exist.

#2
Front (Question)

Element

Back (Answer)

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.

#3
Front (Question)

Molecule

Back (Answer)

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

#4
Front (Question)

Compound

Back (Answer)

A substance made of atoms from two or more elements.

#5
Front (Question)

Proton

Back (Answer)

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

#6
Front (Question)

Neutron

Back (Answer)

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

#7
Front (Question)

Electron

Back (Answer)

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

#8
Front (Question)

Atomic Number

Back (Answer)

Number of protons. Top number in element box

#9
Front (Question)

Mass Number

Back (Answer)

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

#10
Front (Question)

Subscript

Back (Answer)

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

#11
Front (Question)

Chemical symbol

Back (Answer)

A one or two letter representation of an element.