Answer:
The another word for microorganism is microbe
Atomic mass iron ( Fe ) = 55.84 a.m.u
55.84 g ------------ 6.02x10²³ atoms
24.0 g ------------- ??
24.0 x ( 6.02x10²³) / 55.84
=> 2.58x10²³ atoms
Because the nuclear charge increases across a period and so it has a stronger pull on the outer electrons and will pull in the radius
