Question

What could be the valence electrons in an atom X having atomic number 11 . Identify the element X

Answer 1

the element is sodium
e. c of sodium = 1s²,2s² 2p6, 3s¹

so no. of valence electron is 1

hope its may help you...

Answer 2

If u break the atomic number into its electronic configuration, it becomes 2,8,1.
Thus, the number of valence electrons is 1.
This is the configuration of Sodium, so element X is Na.