The total number of protons and neutrons in the nucleus.
Mass number
A radioactive element is used in nuclear power plants. It has 92 protons
Uranium
A single type of atoms have the same protons number in the nucleus
Element
Negatively charged particle in the atom.
Electron
It is to build and maintain strong bones
Calcium
The lightest element which has only one proton.
Hydrogen
Positively charged particle in the atom.
Proton
Elements in the same row that have the same number of electron shells.
Period
Element known as good conductor of electricity, Symbol is Cu.
Copper
A particle in the atom that have no charge.
Neutron
An element is the name of a planet in the solar system.
Mercury
The elements in the same column, have the same number of valence electrons.
Group
The atomic number of this element is 26.
Iron
It is the basic unit of matter.
Atom
Au is a symbol of this element.
Gold
Helium, Neon belong to this group of elements.
Noble gases
Most common element in the air.
Nitrogen
The number of protons in the nucleus.
Atomic number
A basic element of life, present in graphite and diamond.
Carbon
The name of group 17.
Halogen