10
Jhumur Khanam6yyy
21 5s
Numbers, listed in 5s and 10s, between 40 and 60 but including both numbers are:4045505560Numbers, listed in 5s and 10s, between 40 and 60 but excluding both numbers are:455055
In the Rb atom, the electron configuration is [Kr]5s^1. This means there is 1 electron in the 5s sublevel of the Rb atom.
If you mean 2/5 then 2/5 times 100 = 40%
16.
20
7
90
75
24
i think there are 18 digit 5s.
Exactly 33 of them