elements of group 18 are called zerovalent..why?? atomic size increases down the group..why?
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1.Group 18 elements have their outermost shell completely filled and the atoms of these elements have no tendency to gain or lose electrons. Thus, the elements of this group are zero valent and most unreactive.
2.on moving down in a group, a new shell is added, so distance between valence electron and nucleus increases hence atomic size increases as we move down in a group
2.on moving down in a group, a new shell is added, so distance between valence electron and nucleus increases hence atomic size increases as we move down in a group
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