Explain the following observations i.
The boiling point of halogens increase down the group in the
periodic table. It increases due to the strength of (2 marks)​

State one important difference between a physical change and a chemical change?

What happens to the temperature of a substance when the average kinetic energy of its particles increases?

Which is a characteristic of the electron sea model for metallic bonding? molecular orbitals overlap to produce bands. electrons flow easily between metal nuclei. electrons are in fixed positions in the orbitals. atomic nuclei are arranged in an irregular pattern.