Nuclide of Helium is He 2 4 . Write down the mass number and atomic number of the element.

Mass number is the total number of neutrons and protons present in the nucleus of an atom and atomic number is the total number of protons. Nuclide of Helium is He 2 4 . The mass number of the given nuclide is 4 and atomic number is 2 . Hence, number of protons is equal to number of electrons = 2 Number of neutrons = 4 - 2 = 2

Write pairs of isotones and one pair of mirror nuclei from the following, B 5 10 , C 6 12 , 13 27 Al , C 6 11 , Si 14 28 .

B 5 10 C 6 12 Al 13 27 C 6 11 Si 14 28 Number of p 5 6 13 6 14 Number of n 5 6 14 5 14 The atoms having an equal number of neutrons are called isotones, from the above table, the pair of isotones are: (a) B 5 10 and C 6 11 (b) Al 13 27 and Si 14 28 An atomic nucleus that contains a number of protons and a number of neutrons that are mutually interchanged in comparison with another nucleus are called mirror nuclei. In the given species there is no mirror nuclei.

Chlorine has isotopes, Cl 17 35 and Cl 17 37 in the ratio 75 : 25 . Calculate the atomic mass of Chlorine.

The atomic mass of an element represents the weighted average of all the of that element occurring naturally. The mass number of the isotopes are 35 and 37 respectively. The atomic mass of Chlorine from the given isotopes is, = 35 × 75 + 37 × 25 100 = 2625 + 925 100 = 3550 100 = 35 . 5 u

MEDIUM

Earn 100

Classify nuclides on the basis of nuclear stability.

Important Questions on Nuclear chemistry and radioactivity

EASY

Chemistry>Physical Chemistry>Nuclear chemistry and radioactivity>Classification of nuclides

What are different types of nuclides?

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Chemistry>Physical Chemistry>Nuclear chemistry and radioactivity>Classification of nuclides

Nuclide of Helium is

{}_{2}^{4}{He}

. Write down the mass number and atomic number of the element.

MEDIUM

Chemistry>Physical Chemistry>Nuclear chemistry and radioactivity>Classification of nuclides

Write pairs of isotones and one pair of mirror nuclei from the following, ${}_{5}^{10}B, {}_{6}^{12}C, {}_{13}^{27} Al, {}_{6}^{11}C, {}_{14}^{28}{Si}$ .