Use the equation to answer the question.

Question

21H+ 21H→ 42H+energy

Which statement best describes the mass numbers of the atoms in the reaction?

(1 point)
Responses

There is one atom with a mass number of 2.
There is one atom with a mass number of 2.

There are two atoms with mass numbers of 1.
There are two atoms with mass numbers of 1.

There are two atoms with mass numbers of 2.
There are two atoms with mass numbers of 2.

There is one atom with a mass number of 1.

Answer 1

The equation provided is:

\[ 21H + 21H \rightarrow 42H + \text{energy} \]

In this equation:

• \( 21H \) represents two hydrogen atoms, each with a mass number of 2.
• \( 42H \) (while not a common notation) can be interpreted as a heavier hydrogen isotope or a result of the fusion reaction.

Based on the equation, the mass number of the original hydrogen atoms (represented as \( 21H \)) is 2, and there are two of these atoms.

Therefore, the correct statement that best describes the mass numbers of the atoms in the reaction is:

There are two atoms with mass numbers of 2.