Element

 Element:

An element is a substance that is made entirely from one type of atom. 

For example, the element hydrogen is made from atoms containing a single proton and a single electron. 

6) Atomic number

The number of protons in the nucleus of an atom determines an element's atomic number. 

In other words,In the modern periodic table, the elements are actually arranged in order of increasing a

tomic number--that's the number of protons in one atom of a particular element. An undisturbed atom is electrically neutral, so

 the number of electrons in it is the same as its atomic number.

Element: An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron. 

Atomic number : The number of protons in the nucleus of an atom determines an element's atomic number. 

Atomic number:  It is the number of protons in one atom of a particular element. An undisturbed atom is electrically neutral, so the number of electrons in it is the same as its atomic number.

Atomic mass: The mass of an atom or a molecule is often called its atomic mass. Mass is a basic physical property of matter and strictly speaking there is no difference between mass and atomic mass.

Nomenclature : A system of names used in a particular discipline, as in medicine and surgery, anatomy and biochemistry, etc. A standard system of nomenclature presupposes the existence of an organized classification of the entities within that field. 

Isotopes : Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. 

Allotropes : An allotrope is a variant of a substance consisting of only one type of atom. It is a new molecular configuration, with new physical properties. Substances that have allotropes include carbon, oxygen, sulfur, and phosphorous.