Question

If an atom has completely filled K and L shells, find its atomic no. .
Please be fast!!!. Whoever answerd this Q first, will be marked as brainliest.!

Answer 1

Atomic number if K and L shells are completely filled is 10.

Answer 2

We know that K shell can maximum has 2 electrons.

L shell can maximum has 8 electrons.

Given that K and L shell has been completely filled.

So, the total number of electrons = 2 + 8

= 10

Now for an element, the number of electron = number of protons

=> number of protons = 10

Now number of protons = atomic number

So the atomic number of the atom is 10


Answer :- 10


» More Details «

→ The element whose atomic number is 10, is Neon

→ Neon is inert gas, which means its valency is 0, that is, it has very low combining capacity.