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Q: How many 7s are there in 35?

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5

No. There are ~37.57 of them.

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'

5.28751 7s equals 37.

Two electrons (each with opposite spins) in the '7s orbital'

5x7=35, then 3-1=2, so 35+2=37

6

answer:4

There are 3168 such numbers. 2673 have one 7 459 have two 7s 35 have three and 1 has all four 7s. Numbers with leading 0s are excluded.

8

18

14

80.

2 electrons

10

Expressed algebraically, this would equal 7s - 5.

18/7

4

100

Exactly 30 of them

13

14

11 r3

There are: 777/7 = 111

7, remainder 2