Question

1)The number of atoms present in a molecule of an element is known as
2)------is used to represent elements​

Answer 1

Answer:

1.The number of atoms present in the molecule of an element is called its atomicity. It can be determined as a ratio of molecular mass and atomic mass. For example- An oxygen molecule consists of 2 atoms of oxygen.

Explanation:

2.Chemists use symbols to represent elements. A symbol is a letter or picture used to represent something. Chemists use one or two lettters to represent elements.

Answer 2

Answer:

1) Atomicity is the number to represent no. of atoms in an element

2) symbols are used to represent elements