Question

use the equation to answer the question. (_{1}^{2}h+_{1}^{2}h
ightarrow_{2}^{4}h + \text{energy}). which statement best describes the mass numbers of the atoms in the reaction? (1 point) there is one atom with a mass number of 1. there is one atom with a mass number of 2. there are two atoms with mass numbers of 2. there are two atoms with mass numbers of 1.

Explanation:

Step1: Analyze the reactants

The reactants are two $_{1}^{2}\text{H}$ atoms. The mass - number of each $_{1}^{2}\text{H}$ atom is 2.

Step2: Analyze the product

The product is $_{2}^{4}\text{H}$ with a mass - number of 4.

Step3: Count atoms and mass - numbers

There are two atoms with mass numbers of 2 in the reactants.

Answer:

There are two atoms with mass numbers of 2.