00:01
Identifying the following atoms or ions.
00:03
So we have three protons, four neutrons, two electrons, one proton, zero electrons, three protons, three electrons, four neutrons, and lastly seven protons, ten electrons and eight neutrons.
00:25
So the number of protons is equal to the number of electrons, which is equal to the atomic number.
00:30
So the atomic mass is the number of protons, add the number of neutrons, and the number of neutrons is the atomic mass subtract the number of protons.
00:39
So if we look at a, so we have them listed a, b, c and d.
00:46
So here we have three protons, four neutrons and two electrons.
00:52
So the atomic mass, this being the number of protons, add the number of electrons, is equal to seven.
00:56
We add four and three.
00:59
So this is lithium...