the position of three elements A B and C in the periodic table is shown below: give reason 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 1
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dikshasharma7714:
and A is Na
ya i corrected it above
ya A is sodium,alkali metal
and a is Na sodium
k,
i corrected it bro
so thats the reasons for your questions, diksha
k,
thankyou
no prob :)
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A is sodium , B mg c is F
we need to explain it
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a) Element A is metal as it is group 1 element which can easily donate its valence electron.
b) Element B has larger atomic size than the element C because Atomic size increases as we move down the group
c) Element C has a valency of 1 as it can accept one electron to complete its octet.
Explanation:
Metals are elements which can donate electrons. Group 1 elements have general configuration of and thus can easily donate its valence electron.
On moving down a group, the nuclear charge increases but electrons are being added to new shells and the effect of addition of new shells is more pronounced, thus the valence electrons move far from the nucleus, the atomic radii increase.
Valency is the number of electrons it lose or gain in order to acquire stable configuration. The element C has 7 valence electrons and thus it gains 1 electron to acquire noble gas configuration. Thus valency is 1.
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