Question

pls explain me this...i don't understand this rule...​

Answer 1

that's easy bro

the 1st shell has 2 electrons

while all other shells has 8 electrons

so if there 11 electrons in an element

then there will be 3 shells for that element

as 2,8,1

hope it helps

have a nice day ahead bro

peace out

Answer 2

Answer:

above one

Explanation:

Bohr Bury scheme