number of neutrons

The recurrence of similar properties of the elements when they are arranged in the order of increasing atomic number, after certain regular intervals, is called periodicity. Remember Relation between Mass Number and Atomic Number Atomic Number (Z) is the ..

The distance from the centre of the nucleus to the outermost shell of an atom is called the atomic radius of that atom. Electrons in the same period progressively increase from left to right, as the atomic number increases, e.g., in the 3 rd period, from sodium (Z = 11) to chlorine ..

Atomic Size and Atomic Radius - The distance from the centre of the nucleus to the outermost shell of an atom is called the atomic radius of that atom (Fig. 2.1..

The process of splitting of a nucleus of a heavy atom into a number of light nuclei with the liberation of large amount of energy and two or three neutrons is called nuclear fission. Example: When U-235 is bombarded by a neutron it splits into barium, krypton and 2.5 h..

Atom is the smallest particle of an element, which may or may not have independent existence. It is made up of subatomic particles like electrons, protons and neutrons. Atoms of one type of element differ from those of the other due to different number of subatomic particles. ..

Atom - Atom is the smallest particle of an element, which may or may not have independent existence. It is made up of subatomic particles like electrons, protons and neutrons. Atoms of one type of element differ from those of the other due to different number of subatomic partic..

It is the force of attraction existing between the nucleons i.e., between two protons, or two neutrons, or a proton and a neutron. Nuclear force is a short range force and it is effective only when the nucleons are closely packed inside the nucleus. In a heavy atom the size of ..

;). For Balmer series, n 1 = 2, n 2 = 3,4,5,… For Paschen series, n 1 =3, n 2 = 4,5,6… For Brackett series, n 1 = 4, n 2 = 5,6,7…. For P fund series, n 1 = 5, n 2 = 6,7,8…. Total energy of an electron in a stationary orbit is calculated from the relation Atomic masses ar..

Einstein derived a formula given the relation between mass and energy as E = mc 2 . Here 'm' is the mass, 'c' is the velocity of light and 'E' is the energy. This equation has given equal states to mass and energy. It states that a mass m has energy E given by the above formula. Since the velocity ..

Naturally occurring radioactive substances have high nucleon number. It is possible to make artificial radioactive substances by bombarding lighter nuclides with - particles, protons or neutrons. The radioactive substances produced in this manner are known as radioisotopes. A nu..