Question

Define Valency Write down the symbol of Flourine, Potassium, Cobalt and Mercury. Draw electronic configuration and calculate the valency of Nitrogen and Sodium


Q.2 Write two uses of each: 1) concave mirror 2) Convex mirror When does the convex lens form a virtual image? We cannot see through the bent pipe. Give reason.​

Answer 1

Valency is a measurement of the power of an atom to combine with others, by the number of hydrogen atoms it can combine with or take the place of.

Fluorine is F

Potassium is K

Cobalt is Co

Mercury is Hg