THE HUMAN BODY IN HEALTH AND ILLNESS BY BARBARA 2026 PRACTICE SET MOCK EXAM REVISION NOTES AND SOLUTIONS EXPERT GRADE A+

THE HUMAN BODY IN HEALTH AND ILLNESS BY
BARBARA 2026 PRACTICE SET MOCK EXAM
REVISION NOTES AND SOLUTIONS EXPERT
GRADE A+

◉ Neutrons carry _______ charge. Answer: No electrical charge.


◉ Electrons carry a ______ charge. Answer: Negative electrical charge.


◉ ______ is the simplest and smallest atom. Answer: Hydrogen.


◉ What is a compound? Answer: If a molecule is built from two or
more different elements.


◉ What is the atomic number? Answer: The number of protons in
the nucleus.


◉ How is the atomic mass determined? Answer: By adding the
numbers of the protons and neutrons in the nucleus.


◉ What is an isotope? Answer: A different form of the same atom.

, ◉ Describe an isotope. Answer: Often unstable, and their nuclei
break down, or decay, giving off energy.


◉ What are unstable isotopes called? Answer: Radioisotopes.


◉ The process of decay is called _______. Answer: Radioactivity.


◉ Electrons surround in the nucleus in orbits called energy levels or
________. Answer: Electron shells.


◉ How many electrons can each shell of the nucleus hold? Answer:
The inner shell can only hold two, while the second and the third can
hold eight each.


◉ What are the three types of chemical bonds? Answer: Ionic,
convalent, and hydrogen.


◉ Describe ionic bond. Answer: Caused by a transfer of electrons
between atoms.


◉ Describe covalent bond. Answer: Sharing of electrons by the outer
shells of the atoms.


◉ What type of bond is water? Answer: Covalent bond.