Question

An element y having 11 protron in the nucleus and 12 neurtron then find the atomic number at mass group and period number

Answer 1

Answer:

element having 11 protons means it's atomic number is 11

that means the element is sodium(Na).

And atomic mass=protons+neutrons

                          ⇒11+12

            mass=23 amu

and its valency shell is 2S1

i.e., it is first group of periodic table and 2nd period.

Explanation: