Question

An element ‘M' has 50% of the electrons filled in the 3^rd shell as in the 2^nd shell. The atomic number of ‘M’ is ______.

Options

• 10

• 12

• 14

• 18

Answer 1

An element ‘M' has 50% of the electrons filled in the 3^rd shell as in the 2^nd shell. The atomic number of ‘M’ is 14.

Explanation:

Si has a 14th atomic number and an electrical configuration of 2, 8, and 4. The third shell of silicon is packed with 50% as many electrons as the second shell.