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A-Z of invisible things

Can you name these things which we can't see with the naked eye?
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XYU
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Last updated: June 9, 2025
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First submittedJune 9, 2025
Times taken24
Average score23.1%
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Clue
Thing
A
Breathable substance which is all around us
Air
B
Dense object in space where you wouldn't want to go on holiday
Black hole
C
Tiny thing which causes COVID-19 and some colds
Coronavirus
D
Same type of thing as the above, but borne by mosquitos and causing a fever
Dengue virus
E
The area surrounding charged particles
Electric field
F
The smallest single unit of an element used in toothpaste
Fluorine atom
G
The electromagnetic radiation with the shortest wavelength and highest energy
Gamma ray
H
Microscopic entity which can cause AIDS
HIV
I
Radiant energy which causes the sensation of heat, from the sun, etc
Infrared
J
Female-sounding bacterium, bearing the name of a country
Jordanella
K
Unit of another element, a gas associated with Superman
Krypton atom
L
Bacterium which sometimes causes food poisoning
Listeria
M
Radiation used in a type of oven, with a long wavelength
Microwave
N
Very lightweight particle which can pass straight through solid matter
Neutrino
O
New flavour of the COVID item in C and S which evolved and appeared in 2021
Omicron variant
P
Anti-matter which is like an electron but with the opposite charge
Positron
Q
Minute subatomic particle
Quark
R
EM radiation of the longest wavelength, used for TV broadcasts and mobile phones
Radio wave
S
The specific name of the infective agent which causes COVID-19
SARS-CoV-2
T
A single unit of element number 22, a strong metal
Titanium atom
U
Short-wavelength radiation which causes us to get a suntan
Ultraviolet
V
Infective organic entity already mentioned; also, malicious software
Virus
W
The particle said to be responsible for the weak nuclear force
W boson
X
Radiation which helps medics to see inside our bodies
X-ray
Y
One single-celled fungus used in making bread
Yeast
Z
Drifting sea animals that are normally too small to sea
Zooplankton
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