Question

_____________ consists of single type of atoms in a molecule. (i) Ammonia (ii) Hydrogen (iii) Methane (iv) Water​

Answer 1

Hydrogen consists of a single type of atom in a molecule.

1. Ammonia has the chemical formula of NH₃.  So, it is made up of two elements nitrogen and Hydrogen.
2. Methane has the chemical formula of CH₄. So, it is made up of two elements carbon and Hydrogen.
3. Water has the chemical formula of H₂O.So, it is made up of two elements hydrogen and oxygen.
4. Hydrogen is a molecule having a chemical formula of H₂.

Hence, the answer to the question is Hydrogen.

Answer 2

Hydrogen consists of a single type of atom in a molecule. Explanation:

• Hydrogen is defined as a chemical element having the symbol H and atomic number 1. Hydrogen is the lightest element. In the standard state, hydrogen is a gas composed of diatomic molecules of the formula $H_{2}$. It is colorless, odorless, non-toxic, and highly flammable.

• Ammonia is a  compound consisting of one nitrogen atom and three hydrogen atoms.
• The water molecule has three atoms. Two hydrogen atoms (H)  and one oxygen atom (O).
• Methane is a  compound composed of one carbon atom and four hydrogen atoms.