Question

What is velocity? Explain in detail

Answer 1

The speed of an object in a particular direction is known as velocity. It is a vector quantity. e.g.
a car moving in a particular direction.

Answer 2

the valency is the combinig capacity of an element.for each and every element there is a valency number.for example:
*the combining capacity of aluminium is 3
* the combining capacity of sodium is 1
* the combining capacity of calcium is 2