With reference to atoms & molecules, which of the following statement is correct?
1
Atom is a divisible particle, which can be created or destroyed through chemical reaction.
2
The positively charged ion is known as a ‘anion’.
3
The molecular mass of a substance is calculated by taking the sum of the atomic masses of all the atoms in a given molecule.
4
During a chemical reaction, sum of the masses of the reactants and products changes, which is known as the ‘Law of Conservation of Mass.