Answers

2015-02-13T19:08:02+05:30
Actually it never changes as in 16 the group all the elements have 4 valency electrons in outermost shell so they can neither accept nor lose the electrons.
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2015-02-15T07:03:34+05:30

the elements in 16th group don't gain electrons as they have 4 valency . but when we go from top to bottom in a group (in a non metals) tendency to gain electrons decreases due to the adding of shell at every step .
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