Atomic Combinations is one of 9 topics in the Grade 11 Physical Sciences CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. A covalent bond forms when two atoms:
Share a pair of electrons
Transfer electrons completely from one atom to the other
Repel each other permanently
Lose all their valence electrons
Answer: Share a pair of electrons — A covalent bond involves two atoms sharing a pair of electrons, in order to both achieve a stable, full outer energy level.
Easy
2. Which electrons are involved in the formation of a chemical bond?
Only the valence electrons (outermost energy level)
All the electrons in the atom, including inner shells
Only the electrons closest to the nucleus
No electrons; only protons are involved in bonding
Answer: Only the valence electrons (outermost energy level) — Only valence electrons (in the outermost occupied energy level) participate in chemical bonding.
Medium
3. Name the type of covalent bond, as found in the N2 molecule (N≡N), consisting of three shared pairs of electrons.
Answer: triple covalent bond — N2 has a triple covalent bond, consisting of three shared electron pairs between the two nitrogen atoms.
