For the reaction A → Products, successive half-lives are observed to be 10.0 min and 40.0 min. The reaction follows the integrated rate law
a. [A] = -kt + [A]0

b. ln[A] = kt + ln[A]0

c. 1 / [A] = kt + 1 / [A]0

d. 1 / [A}2 = kt + 1 / {A}^2 0

e.
none of these

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

put the answers   and i could answer.

it is reliable if two scientists recorded it