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Chemistry Terms A-Z

Given a definition, how many can you name?
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Polen
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Last updated: January 5, 2026
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First submittedNovember 28, 2025
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Definition
Term
A
The smallest unit of matter
Atom
B
A substance that has a pH greater than 7.0
Base
C
A substance made up of two more chemically bonded elements
Compound
D
The movement of particles from higher to lower concentration
Diffusion
E
The tendency of an atom to attract electrons
Electronegativity
F
The transition of a substance from a liquid to a solid
Freezing
G
The lowest possible energy state of an atom
Ground state
H
An element of Group 17. Its name means "salt former"
Halogen
I
An atom with a different number of neutrons
Isotope
J
The SI unit of energy
Joule
K
The SI unit of temperature
Kelvin
L
A substance with a fixed volume, but takes the shape of its container
Liquid
M
A substance with both properties of metals and nonmetals
Metalloid
N
The dense center of an atom
Nucleus
O
Gaseous element whose atomic number is 8
Oxygen
P
Subatomic particle with a positive charge
Proton
Q
What protons and neutrons are made up of
Quark
R
When an atom has an unstable nucleus and undergoes decay
Radioactivity
S
A mixture that is uniform throughout, also called a homogeneous mixture
Solution
T
An element with an atomic number greater than 92
Transuranium element
U
Created by Werner Heisenberg that states that the more one is property measured, the other is unknown
Uncertainty principle
V
An electron in the highest, or outermost, energy level
Valence electron
W
A transparent liquid that is a common buffer; also required for life
Water
X
Light radiation that lies between ultraviolet and gamma rays on the spectrum
X-ray
Y
The amount of product produced in a chemical reaction
Yield
Z
Metallic element whose atomic number is 30
Zinc
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1 Comments
kchantheman314
+1
Level 21
Dec 19, 2025
Thank you for the quiz. For S, did you mean "homogeneous mixture", not "heterogeneous"?
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