Valency of an element refers to the combining capacity of a molecule of the element.

Valency is always a whole number.

Valency is always equal to the number of electrons in the outermost shell.

Valencies are interchanged and are written as subscripts next to the symbols.

A plus sign ‘+’ is used between the reactants and the products.

Number of atoms of the reactants must be equal to the number of the same type of atoms of the products.

According to the law of conservation of mass, matter can neither be created nor destroyed in a chemical reaction.

Which of the following refers to the combining capacity of an element?

Which of the following is formed when an atom or a group of atoms loses electron(s) by developing a positive charge?

A chemical equation has reactants on the left-hand side. What is present on the right-hand side?

Which kind of equation has an equal number of atoms of one or more elements in the reactants and products?

Decomposition of water into hydrogen and oxygen occurs in the presence of which of the following?