Water (h2o) is composed of the same elements as hydrogen peroxide (h2o2) why do these substances have different properties a.) the atoms are arranged differently in each molecule b.) the molecules are the same c.) the atoms are the same d.) water has more atoms than hydrogen peroxide

Option A is correct;

A.) The atoms are arranged differently in each molecule

Water and hydrogen peroxide are made of the same elements: oxygen and hydrogen. However, hydrogen peroxide (H2O2) has 1 more oxygen than water (H2O).

Hydrogen peroxide is very unstable and breaks down readily into water and a single oxygen molecule.

And also the arrangement of atoms is different in each molecule.