Solid iron reacts with sulfuric acid (H2SO2) to produce iron (II) sulfate and hydrogen gas. If 850 mL of hydrogen gas are collected at STP, how many grams
of iron (II) sulfate are also produced?

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

може ли да зареждате повече информация, моля