A set is a group of objects that are related in some way.
An element is an object that belongs to a set.
e.g. 1 - Colours of the rainbow
The colours of the rainbow are a set.
Blue is an element of the colours of the rainbow.
So, we can say:
The element "blue" is a member of the set "colours of the rainbow".
e.g. 2 - Odd integers between 0 and 10
This set is of odd whole numbers between 0 and 10.
The elements that belong to this set are 1, 3, 5, 7 & 9. We can right this in short hand by wrapping the elements in a set of braces.
{1, 3, 5, 7, 9} - this means a set with the elements 1, 3, 5, 7 & 9.
So we can say:
The elements 1, 3, 5, 7 & 9 are members of the set of odd integers between 0 and 10.
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null set or empty set, is a set with no elements.
If you mean null set, that's a set having no elements, or only zeros as elements.
The empty set is a set that has no elements.
A null set.