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(a) D and E as they both have same mass no. but different atomic number.
(b) 3
(c) Sulphur. Non-metal
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(a) D and E are the isobars because they have the same mass number 40 but different atomic numbers,
(b) Element C has atomic number 7, ie it has 7 electrons, Therefore its electronic configuration is 1s2 2s2 2p3. Therefore, it needs 3 more electrons to fill its 2p subshell. Therefore, the valency of C is 3.
(c) Element B is Sulphur (atomic no 16) and its non metallic in nature
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