280
777
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'
6
8
5
10
6
answer:4
14
80.
18