The position of three elements A, B and C in the periodic table is shown below:


Giving reasons explain:
(a) Element A is a metal.
(b) Element B has larger atomic size than the element C.
(c) Element C has a valency of one.

Dear Student,


(a) A is metal because it is in group I and has one electron in outermost shell.
(b) B is in 3rd period which means it has more shells and so, the size is bigger.
(c) C has valency = 1, because it is in group VII and requires 1 electron to complete the octet.


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(a) IN LEFT HAND SIDE ATOMS HAVE LESS ATOMIC NUMBER MEANS THEIR SHELLS ARE LESS AND LESS ELECTRONS SO NUCLEUS HAVE NOT MORE ATTRACTION FORCE TOWARD ELETRONS SO ELECTRONS EASILY GET LOST WHICH IS A PROPERTY OF A METAL

(b)ELEMENT B HAVE MORE SHELLS THAN C SO IT HAVE MORE ATOMIC SIZE

(c) IT OCCURS IN 7th GROUP MEANS IT HAVE 7 VALENCE ELECTRONS SO IT HAVE REQUIREMENT OF 1 TO COMPLETE ITS OCTET

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