Bonding and Structure of First 20 Elements

Which of the following elements exists as discrete covalent molecules under standard conditions?

• Neon

• Phosphorus

• Aluminium

• Silicon

Which type of bonding is found in elements such as magnesium and aluminium?

• Ionic bonding

• Covalent bonding

• Metallic bonding

• Van der Waals bonding

What type of structure does diamond have?

• Monatomic

• Discrete covalent molecular

• Covalent network

• Metallic lattice

Which of the following elements exists as a monatomic gas at room temperature?

• Nitrogen

• Fluorine

• Argon

• Oxygen

Which element forms a covalent network structure similar to silicon?

• Sulfur

• Boron

• Calcium

• Chlorine

Which statement correctly describes the bonding in sodium?

• Positive ions in a sea of delocalised electrons

• Shared pair of electrons between atoms

• Attraction between positive and negative ions

• Overlapping p orbitals forming delocalised π-bonds

Which of the following elements exists as diatomic molecules at room temperature?

• Helium

• Neon

• Hydrogen

• Boron

Which element from the first 20 has a giant metallic lattice structure and is a good conductor of electricity?

• Carbon

• Aluminium

• Silicon

• Sulfur

Which property is typical of a substance with a covalent network structure?

• Low melting point

• Poor electrical conductivity when molten

• Soluble in water

• Very high melting point

Which of the following describes the structure of phosphorus under standard conditions?

• Covalent network

• Discrete covalent molecule

• Monatomic gas

• Ionic lattice