21. Which of the following statements best describes the neon (Ne) atom

Neon (Ne) is an element, one of many different kinds of matter that occur on Earth.
The diagram below shows a model of one atom of the element neon.

•It is identical with atom of some other element
•It can be broken down into smaller parts by chemical means
•It is the smallest unit of neon that has all the properties of neon
•It is the largest unit of lien that can combine with other elements.