What is the nickname for hunds rule

Electronic configuration is the short representation which we use to represent the structure of an atom.

Orbital diagram too is used for this purpose.

A circle or a square is used to represent an orbital.

Each orbital occupies 2 electron.

Subshells s contains 1 orbital with 2 electrons

p subshell contains 3 orbital with 6 electrons

d with 5 orbitals and 10 electrons  

f with 7 orbitals and 14 electrons.

Hund’s Rule says each orbital is filled singly first before we fill it up with the second electron in it.

Thus Hund’s Rule is also called as “Empty bus seat Rule” as the bus passenger sits and occupies alone in a double seat.

Then another one arrives there.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally