00:01
Okay, so we are given that the nucleus of interest is a potassium nucleus.
00:07
Alright, and we want to write it in the form of x, a, zac, where a refers to the mass number, which tells us the total number of nucleons.
00:21
Z is the number of protons that is in the nucleus, and x finally is the element itself.
00:30
So since we are given that the element is potassium, right? the element actually determines, right, is determined by the number of protons.
00:43
So we can immediately write down that the exact number, number of protons, must be 19.
00:51
This is the number of protons for all potassium...