Question

Valancies of 20 - 30 elements

Answer 1

Answer:

Ur answer is in the attachment:-

Answer 2

Explanation:

$\mathbf{ \rm \: Valencies \: of \: first \: 30 \: elements :} \\\begin{array}{| c | c | c |} \bf Atomic\:No. & \bf Elements & \bf Valency \\ 1 &\sf Hydrogen & 1 \\ 2 &\sf Helium & 0 \\ 3 &\sf Lithium & 1 \\ 4 &\sf Berrylium & 2 \\ 5 &\sf Boron & 3 \\ 6 &\sf Carbon & 4 \\ 7 &\sf Nitrogen & 3 \\ 8 &\sf Oxygen & 2 \\ 9 &\sf Flourine & 1 \\ 10 &\sf Neon & 0 \\ 11 &\sf Sodium & 1 \\ 12 &\sf Magnesium & 2 \\ 13 &\sf Aluminium & 3 \\ 14 &\sf Silicon & 4 \\ 15 &\sf Phosphorus & 3 \\ 16 &\sf Sulphur & 2 \\ 17 &\sf Chlorine & 1 \\ 18 &\sf Argon & 0 \\ 19 &\sf Potassium & 1 \\ 20 &\sf Calcium & 2 \\ 21 &\sf Scandium & 3 \\ 22 &\sf Titanium & 4 \\ 23 &\sf Vanadium & 5,4 \\ 24 &\sf Chromium & 2 \\ 25 &\sf Manganese & 7,4,2 \\ 26 &\sf Iron & 2,3 \\ 27 &\sf Nickel & 3,2 \\ 28 &\sf Cobalt & 2 \\ 29 &\sf Copper & 2,1 \\ 30 &\sf Zinc & 2 \\ \end{array}$