1. Cl2
a free element or compound

Cl₂ is a compound

Pure substance can be any element or compound

Elements if composed of one atom

A compound if it is composed of two or more atoms, either of the same type or of different types

Cl₂ consists of 2 Cl atoms.

Cl with 7 valence electrons will try to get its stability by binding 1 more electron, by covalently bonding with other Cl atoms to form a Cl₂ compound in the form of a gas

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

the correct answer to this question is 2