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Lightest Chemical Elements A-Z

For each letter, name the lightest element in the periodic table whose name starts with that letter.
Beware! In this quiz, element names are concerned, not its symbol. For example, gold (Au) is classified in G.
Quiz by PSTSCCH
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Last updated: May 29, 2014
First submittedMay 9, 2014
Times taken21,051
Average score60.9%
Rating4.50
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Letter
Element
A
Aluminium
B
Beryllium
C
Carbon
D
Dysprosium
E
Europium
F
Fluorine
G
Gallium
Letter
Element
H
Hydrogen
I
Iron
J
 
K
Krypton
L
Lithium
M
Magnesium
N
Nitrogen
Letter
Element
O
Oxygen
P
Phosphorus
Q
 
R
Rubidium
S
Sodium
T
Titanium
Letter
Element
U
Uranium
V
Vanadium
W
 
X
Xenon
Y
Yttrium
Z
Zinc
+2
Level 55
May 9, 2014
Fun!
+1
Level 35
May 18, 2014
Great quiz!
+7
Level 67
May 18, 2014
Pretty amazed I got Dysprosium..
+5
Level 70
Sep 25, 2018
It sounds like a medication for diarrhea or something!
+2
Level 67
Jun 1, 2020
It was the last one I got. I was literally going through the table in my head waiting for a 'd' element
+1
Level 75
May 13, 2021
Pretty amazed I got Potassium for K. No idea where that came from.
+1
Level 54
May 19, 2014
I kept trying Silicon and ran out of time before I remembered the directions said the element's NAME not it's symbol *facepalm*
+2
Level 70
Aug 29, 2016
Um... Silicon's symbol is Si, so it wouldn't beat Scandium nohow.
+2
Level 65
Dec 6, 2016
Yes it would.
+5
Level 48
Mar 2, 2018
Silicon is lighter than Scandium. Scandium is 21 whilst Silicon is 14. Sodium is the lightest 'S' element at 11.
+1
Level 66
Aug 10, 2018
These numbers aren't the weights. They are the number of protons in an atom.
+6
Level 59
Jun 3, 2019
And it just so happens that the elements also go in order of ascending weight so go figure.
+2
Level 66
Apr 2, 2020
@TomHolland That's actually not always true, there are several cases due to some weird properties of elements where an element with a smaller atomic number has a higher atomic weight, e.g. Cobalt (27, 58.93) and Nickel (28, 58.69)
+3
Level 66
Aug 28, 2017
I get what you said, JF.

You thought Sodium would be under letter N, so you never tried it.

+1
Level 34
May 20, 2014
Nyaaagg danged natrium!
+3
Level 16
May 29, 2014
This is somewhat inaccurate; the radius of an atom actually decreases across a period.
+2
Level 48
May 29, 2014
Quiz name is changed to avoid misleading.
+2
Level 51
Nov 13, 2014
I am ashamed of myself getting Rubidium, but not Iron...
+1
Level 27
Mar 18, 2015
Knowing all the elements in order really helps with this one haha!
+2
Level 52
May 11, 2015
I only missed Dysprosium. I haven't learnt my Lanthanoids properly yet.
+1
Level 67
Jan 4, 2019
I got dysprosoim but dont know lanthanoids, never heard of it (im guessing it is a group that contains dysprosium)
+2
Level 48
Feb 15, 2016
I sang the Periodic Table song and got all of them. :P
+2
Level 83
Jul 12, 2016
Spent a long time racking my brain for D and E. When I finally ran out of time and the answer was revealed I realised I probably should have given up some time ago.
+3
Level 67
Aug 29, 2016
The quiz should probably specify that 'lightest' refers to the lowest Atomic Number rather than density. I spent ages trying to figure out how Argon (as a gas) wasn't 'lighter' than Aluminium.
+1
Level 82
Nov 25, 2019
It refers to the mass of the atoms and I think that's quite obvious.
+1
Level 64
Aug 29, 2016
Tricky!
+1
Level 67
Aug 31, 2016
Got it, BOOM! 1:30 to go. Fun quiz!
+1
Level 77
Sep 1, 2016
Thanks for accepting aluminum.
+1
Level 54
May 8, 2017
Probably the easiest quiz I've done. 2:13 left and I haven't had my coffee yet.
+2
Level 62
Jul 27, 2018
Chlorine should be lighter than carbon, right?
+3
Level 78
Nov 29, 2018
And I would have thought Argon was lighter than aluminum too.
+1
Level 76
Jan 21, 2020
These are ordered by atomic mass, not by density
+1
Level 67
Jan 4, 2019
Anyone else like how J, Q and W line up :)

Didnt get phosphorus cause it is an f sound and in my country the word starts with an f aswell. And typed iodine, iridium, indium two or three times.. I didnt get why it didnt work and what i was missing... Iron never came to mind ( I guess that is, because at some point I tried to remember the periodic table by (element) letter, so iron wasnt in that group of i's

+1
Level 44
Sep 19, 2019
yay 100%
+1
Level 73
Jul 7, 2022
Aluminium…

Pronounce it properly, and you will spell it properly