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Isotopes Isobars and Isotones

Chemistry Formulas


About Isotopes Isobars and Isotones

(a) Atomic Number (Z): The atomic number of an element is the number of protons contained in the nucleus of the atom of that element.

(b)Nucleons: Protons and neutrons are present in a nucleus. So, these fundamental particles are collectively known as nucleons.

(c)Mass Number (A): The total number of protons and neutrons i.e, the number of nucleons present in the nucleus is called the mass number of the element.

(d) Nuclide: Various species of atoms in general. A nuclide has specific value of atomic number and mass number.

(e) Isotopes: Atoms of the element with same atomic number but different mass number e.g. 1H1, 1H2, 1H3. There are three isotopes of hydrogen.

(f)Isobars: Atoms having the same mass number but different atomic numbers, e.g. 15P32 and 16S32 are called isobars.

Isotopes and isobars

(g)Isotones: Atoms having the same number of neutrons but different number of protons or mass number, e.g. 2C14, 8O16, 7N15 are called isotones. 

(h) Isoelectronic: Atoms, molecules or ions having same number of electrons are isoelectronic  e.g. N2,CO, CN–.

(i)Isosters : Molecules having  same number of atoms and also same number of electrons are called isosters. e.g., i) N2  and CO ii) CO2 and N2O iii) HCl  and F2

(j) Atomic mass unit: Exactly equal to 1/12 of the mass of 6C12 atom 1 amu = 1.66 to 10–27 kg, If it is converted to energy then E= 931.5 MeV

(h) Isodiapheres: Atoms having same difference between neutrons & protons are called isodiapheres. They have same value of N - Z or  A - 2Z

For More Terms visit chemistry Formulas Page. 

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