Question

If an atom of an element has 11 electrons in the third shell , then find the atomic number

Answer 1

Answer:

scandium

Explanation:

• as it's valence electrons are present in third shell it means that it first and second shells are completely filled.so the number of electrons in the given element is sum of electrons present=no. of electrons in k shell+L shell+M shell=2+8+11=21.Therefore the element with 21 electrons in it is scandium