Question

What is the Valency and valence electrons of the first $20$ elements?

Answer 1

Valency:

• “The electrons present in the outermost shell of an atom are known as the valence electrons.”
• “Valency is the combining capacity of an atom.”
• The valency and valence electrons for the first $20$ elements are discussed below:

Atomic number	Element	Valence electron	Valency
$1$	Hydrogen	$1$	$1$
$2$	Helium	$2$	$0$
$3$	Lithium	$1$	$1$
$4$	Beryllium	$2$	$2$
$5$	Boron	$3$	$3$
$6$	Carbon	$4$	$4$
$7$	Nitrogen	$5$	$3$
$8$	Oxygen	$6$	$2$
$9$	Fluorine	$7$	$1$
$10$	Neon	$8$	$0$
$11$	Sodium	$1$	$1$
$12$	Magnesium	$2$	$2$
$13$	Aluminum	$3$	$3$
$14$	Silicon	$4$	$4$
$15$	Phosphorus	$5$	$3$
$16$	Sulfur	$6$	$2$
$17$	Chlorine	$7$	$1$
$18$	Argon	$8$	$0$
$19$	Potassium	$1$	$1$
20	Calcium	$2$	$2$