9th Class Science Structure of the Atom Question Bank Atomic Structure Formative Subjective Problems

Select the isotopes, isobars and isotones from the following: (Note: the symbols are hypothetical) \[_{1}{{A}^{1}}{{,}_{3}}{{D}^{7}}{{,}_{1}}{{C}^{3}}{{,}_{6}}{{L}^{12}}{{,}_{5}}{{B}^{12}}{{,}_{4}}{{E}^{8}}{{,}_{6}}{{S}^{14}}{{,}_{2}}{{T}^{4}}\]

Answer:

Isotopes: These are atoms of same element with same atomic number (Z) and different mass number (A). Isobars: These are atoms of different elements with same mass number (A). Isotones: These are atoms of different elements with same number of neutrons (n). Let us first find the Z, A and n of the given species.

Nuclide Z A N

\[_{1}{{A}^{1}}\] 1 1 0

\[_{3}{{D}^{7}}\] 3 7 4

\[_{1}{{C}^{3}}\] 1 3 2

\[_{6}{{L}^{12}}\] 6 12 6

\[_{5}{{B}^{12}}\] 5 12 7

\[_{4}{{E}^{8}}\] 4 8 4

\[_{6}{{S}^{14}}\] 6 14 8

\[_{2}{{T}^{4}}\] 2 4 2

From the above chart, it is clear that (i) A, C and L, S are pairs of isotopes. (ii) L and B are isobars (iii) D, E and C, T are pairs of isotones.

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Nuclide	Z	A	N
\[_{1}{{A}^{1}}\]	1	1	0
\[_{3}{{D}^{7}}\]	3	7	4
\[_{1}{{C}^{3}}\]	1	3	2
\[_{6}{{L}^{12}}\]	6	12	6
\[_{5}{{B}^{12}}\]	5	12	7
\[_{4}{{E}^{8}}\]	4	8	4
\[_{6}{{S}^{14}}\]	6	14	8
\[_{2}{{T}^{4}}\]	2	4	2

9th Class Science Structure of the Atom Question Bank Atomic Structure Formative Subjective Problems

question_answer Select the isotopes, isobars and isotones from the following: (Note: the symbols are hypothetical) \[_{1}{{A}^{1}}{{,}_{3}}{{D}^{7}}{{,}_{1}}{{C}^{3}}{{,}_{6}}{{L}^{12}}{{,}_{5}}{{B}^{12}}{{,}_{4}}{{E}^{8}}{{,}_{6}}{{S}^{14}}{{,}_{2}}{{T}^{4}}\]

Select the isotopes, isobars and isotones from the following: (Note: the symbols are hypothetical) \[_{1}{{A}^{1}}{{,}_{3}}{{D}^{7}}{{,}_{1}}{{C}^{3}}{{,}_{6}}{{L}^{12}}{{,}_{5}}{{B}^{12}}{{,}_{4}}{{E}^{8}}{{,}_{6}}{{S}^{14}}{{,}_{2}}{{T}^{4}}\]