Answers

2015-08-23T01:18:55+05:30
The size of atom is called atomic size
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2015-08-23T06:18:47+05:30
Atomic size is the distance between the center of the nucleus of the atom to the outermost shell of that atom. 
The periodic trend for atomic size is it increases across a period from right to left and increases topp to bottom in a group. Applying this trend, the order of increasing size is Xe, Sn, Sr, Rb.
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