Question

as we move from left to right across a period

how density changes

Answer 1

1. increases
2. decreases
3. remains constant
4. no particular trend

Answer 2

density is mass per unit volume

Answer 3

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.

Answer 4

mass increases but radius decreases since d = m/V density increases i get it thank you very much !

Answer 5

i do not agree with options 1,2,3,4

Answer 6

but the right side we have gases but here i think they're asking only for atom i hope, not the molecule level

Answer 7

why

Answer 8

http://periodictable.com/Properties/A/Density.st.html

Answer 9

oh it shows left and right groups have least density

Answer 10

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

Answer 11

looks non-metals have less density again breaking the general increasing density trend