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as we move from left to right across a period how density changes

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1. increases 2. decreases 3. remains constant 4. no particular trend
density is mass per unit volume
Density increases. Atomic radius decreases from left to right across a period because: 1) Electrons are being "added" into the same shell, (you know that the shell number doesn't increase across a period) 2) The proton number and number of electrons increases across a period, this causes greater attractive force between positive and negative charges, resulting in decrease in atomic radius as mass increases, therefore greater density.

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Other answers:

mass increases but radius decreases since d = m/V density increases i get it thank you very much !
i do not agree with options 1,2,3,4
but the right side we have gases but here i think they're asking only for atom i hope, not the molecule level
oh it shows left and right groups have least density
some trend still exists, as we move from left to right, s->p->d, upto the last group in d block, the density is increasing
looks non-metals have less density again breaking the general increasing density trend

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