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The boiling points of the elements in Group 7 tend to increase as you go down the group because the molecules get larger and the intermolecular forces get stronger.

A reaction will occur if two reactants collide with each other with enough energy to overcome the 'activation energy'. The activation energy is the minimum amount of energy the reactant particles need in ...

In graphite, each carbon atom is covalently bonded to three other carbon atoms. One of the four outer shell electrons of each carbon atom is therefore not engaged in bonding, and becomes delocalised. Thes...

In group 2 elements, the reactivity is a measure of how easily the atoms lose outer shell electrons. An atom at the top of the group, such as magnesium, has less shells meaning the atomic radius is smalle...

Firstly, we write down all the information we are given from the question into mathematical form.

This equation is 4a-b=38                                        The valu...