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

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

MEDIUM

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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?

MEDIUM

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

Name the most stable nuclide known. Write two factors responsible for its stability.

EASY

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

Cotyledons are also called-

HARD

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

Can an element have more than one nuclide? Justify with example.

MEDIUM

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

An atom

X

has two electrons in the

M

shell. What is its atomic number?

MEDIUM

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

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

EASY

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

Define mirror nuclei.

EASY

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

On the basis of number of neutrons and protons the nuclides are classified as

HARD

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

Chlorine has isotopes,

{}_{17}^{35}{Cl}

and

{}_{17}^{37}{Cl}

in the ratio

75 : 25

. Calculate the atomic mass of Chlorine.

MEDIUM

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

The nuclides with odd number of both protons and neutrons are the least stable. Explain why?

EASY

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

Name the nuclide which does not contain neutron.

MEDIUM

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.

HARD

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

Referring the stability belt of stable nuclides, which nuclides are $\bar{β}$ and $\overset{+}{β}$ emitters? Why?

HARD

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

Identify the following nuclides as : isotopes, isobars and isotones

{H_{1}}^{3}, {He}_{2}^{4}, {C_{6}}^{14}, {Cl}_{17}^{38}, {N_{7}}^{14}, {Mg}_{12}^{24}, {Cl}_{17}^{35}, {S_{16}}^{32}, {P_{15}}^{31}

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

An example of an unstable nuclide is:

EASY

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

Give example of mirror nuclei.

EASY

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

On the basis of the number of _____ and protons constituting the nucleus, the nuclides are classified as isotopes, isotones, isobars and nuclear isomers.

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

Which of the following is an example of unstable nuclide?

MEDIUM

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

On the basis of even-odd of protons and neutrons, what type of nuclides are most stable? Explain.

EASY

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

Write the name of a nuclide without neutron.

Classify nuclides on the basis of nuclear stability.

Important Questions on Nuclear chemistry and radioactivity

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