Atoms are the small particles of which every element is made up of. The atom possesses the properties of its element.
Matter comprises of tiny particles called atoms. The chemical properties of an element will be embedded in its atom. The nucleus of an atom comprises of positive charge which consists of positively charged protons and neutrons which are of neutral charge.
An atom consists of subatomic particles like protons, neutrons and electrons. The positively charged nucleus is surrounded by negatively charged electrons and the electron number is equal to that of the proton number.
In the year 1911, it is from the result of gold foil experiment performed by Rutherford discovery of nucleus has taken place. Atom comprises of several subatomic particles and the dense central core of the atom is called as nucleus. The nucleus of an atom comprises of positive charge which consists of positively charged protons and neutrons which are of neutral charge. The positively charged nucleus surrounded by negatively charged particles called electrons. So, protons and neutrons are together called as nucleons and the total charge of the nucleus is positive. The total mass of the atom is the collective mass of the nucleons.
In the year 1919, Rutherford is credited for the discovery of the proton and for his hypothesis about the existence of the neutron. For his investigations, he was awarded the Nobel Prize in Chemistry in 1908.
Size of the nucleus:Size of an atom size is of the order of 1 Angstrom and the nucleus size is of the order of Fermi meters which are smaller than that of the atom. The nucleus diameter of a hydrogen atom is 1.75 fm and of a uranium atom it is 15 fm.