Chapter 1– Multiple Choice

The solid, _______ has a simple molecular structure.

• magnesium oxide

• sodium

• silicon dioxide

• sulphur

An element X reacts with chlorine to form a compound of formula XCl₂, which is a solid at room temperature. The electronic structure of element X before bonding is _______.

• 2.1

• 2.6

• 2.8

• 2.8.8.2

_______ are the pair of elements that will combine to form a compound that has a high melting point and is unable to conduct electricity in any state.

• Carbon and oxygen

• Carbon and fluorine

• Hydrogen and chlorine

• Silicon and oxygen

The substance _______ consists of both ionic and covalent bonds.

• NH₃

• K₂SO₄

• HCl

• NaCl

An element Q reacts with chlorine to form a compound of formula QCl₃, which is a liquid at room temperature. The electronic structure of element Q before bonding is _______.

• 2.5

• 2.6

• 2.8.7

• 2.8.8.1

In a sulphur dioxide molecule, there are _______ valence electrons on the Sulphur atom after bonding.

• 6

• 8

• 10

• 12

The substance, _______ is made up of a lattice of positive ions and free-moving electrons.

• copper(II) chloride

• hydrochloric acid

• pencil lead

• sodium

The complete electronic structure for the oxide anion, O^2- is _______.

• 1s² 2s² 2p⁴

• 1s² 2s² 2p⁶

• 1s² 2s² 2p²

• 1s² 2s² 2p⁶ 3s²

In a Lewis dot model of a beryllium atom, _______ electrons are around beryllium.

• 1

• 2

• 3

• 4

The representation of valence electrons in the form of dots and lines is called _______.

• ionic structure

• covalent structure

• metallic structure

• Lewis structure