Question

Use the letters only written in the Periodic Table given below to answer the question that follow.
(i) State the number of valence electrons in atom 3.
(ii) Which element shown forms ions with a single negative charge?
(iii) Which metallic element is more reactive than R?
(iv) Which element has its electrons arranged in four shells?
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Answer 1

Answer:

(i) J belongs to the fifth group hence, it has 5 valence electrons.

(ii) M belongs to group number VII hence, it has 7 valence electrons. To attain stability it needs to gain 1 electron and thereby it forms single negative charged ion.

(iii) T is more reactive than R. The reactivity of an element increases down the group.

(iv) The period number indicates the number of shells present hence, T is the element which is having its electrons arranged in four shells.

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