1000 / 7 = 142.85
142 7's are in 1000
Taking every number from 1 to 1000 inclusive, the number of digit 7s in the list totals 300.
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