Since 100, 99 & 98 have no sevens we can limit our search to 1 - 97. There will be ten 7's in the ones column and one 7 in the tens column. So it looks like eleven 7's is the answer.
19
5.28751 7s equals 37.
There is one 7s orbital with two sub-orbitals: 7s(+1/2) and 7s(-1/2) . A picture of this 7s orbital is in 'Related links'
8
5
10
6
answer:4
6
80.
14
18
10