Which statement about bonding is correct?
A.
All the atoms in \(\mathrm{CH}_{4}, \mathrm{NH}_{3}\) and \(\mathrm{H}_{2} \mathrm{O}\) molecules have noble gas electronic configurations.
B.
Calcium chloride is a covalent molecule.
C.
Group I metals gain electrons when they bond with Group VII elements.
D.
Oxide ions in calcium oxide are positively charged.
Exam No：0620_s24_qp_12 Year：2024 Question No：8
Answer:
A
Knowledge points:
2.5.1. State that a covalent bond is formed when a pair of electrons is shared between two atoms leading to noble gas electronic configurations
2.5.2. Describe the formation of covalent bonds in simple molecules
2.5.3.1. low melting points and boiling points
2.5.3.2. poor electrical conductivity
2.5.4. Describe the formation of covalent bonds in simple molecules
2.5.5.1. low melting points and boiling points in terms of weak intermolecular forces (specific types of intermolecular forces are not required)
2.5.5.2. poor electrical conductivity
Solution:
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