00:01
The four most abundant elements by mass in the human body are oxygen, carbon, hydrogen, and nitrogen.
00:09
So we have oxygen, carbon, hydrogen, and nitrogen.
00:13
These four elements make up about 96 % of the human body.
00:17
The next four most abundant elements are calcium, phosphorus, magnesium, and potassium.
00:27
Excluding hydrogen, we'll cross that out, which of these elements would have the smallest size, the largest size, the smallest first ionization energy, and the largest first ionization energy? so if we look at the periodic table, we know on the periodic table that the top right is going to have the smallest radius and the largest ionization energy.
01:18
And things closer to the bottom left are going to have larger radius and a smaller ionization energy.
01:31
So we want to look and see where these elements are on the periodic table to see what's closest to the top right or the bottom left.
01:39
Okay, so for the smallest size, we're going to be looking for what's closest to the top right.
01:46
So among these elements, we have carbon, oxygen, nitrogen, sorry, i have those backwards, carbon, nitrogen, oxygen, and phosphorus is below nitrogen.
02:02
So the one that's closest to the top right, and over here, sorry, we have magnesium, potassium, calcium.
02:22
Okay, so that's where they are on the periodic table.
02:24
We're looking for what's closest to the top right.
02:28
Okay, so the closest one to the top right, here we have oxygen...