Question

Which of the following statements is incorrect?

O Free radicals are dangerous because they emit energy.
O isotopes have the same atomic number but different atomic mass.
O atoms have about the same numbers of protons and electrons.
O All molecules are made of atoms.

Answer 1

Answer: Free radicals are dangerous because they emit energy is incorrect.

Step-by-step explanation:

Free radicals are dangerous because they are highly reactive species with an unpaired electron in their outer shell. This unpaired electron can react with other molecules, including DNA, proteins, and lipids, which can lead to damage and disease. However, free radicals do not emit energy as a general rule.

Isotopes having the same atomic number but different atomic mass is a correct statement. Atoms having the same number of protons and electrons is also a correct statement since atoms are electrically neutral. Finally, all molecules are indeed made of atoms.