(will mark brainliest)
identify the number of atoms on the reactant side of the chemical equation.
fe2o3 + 3h2 → 2fe + 3h2o

there are fe (iron) atoms.

there are o (oxygen) atoms.

there are h (hydrogen) atoms.

There are 2 Fe (iron) atoms.

There are 3 O (oxygen) atoms.

There are 6 H (hydrogen) atoms.

Explanation:

The little numbers which are on the bottom right show the amount of times an atom is there.

Explanation:

Reactants are written on the left hand side of a chemical equation.

In this case, they are Fe2O3 + 3H2

Counting the numbers:

There are 2 Fe (iron) atoms.

There are 3 O (oxygen) atoms.

For Hydrogen, it is a gas with 2 H atoms per molecule. So you need to multiple 3 by 2:

There are 6 H (hydrogen) atoms.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.