What atom has an atomic radius larger than iron? Cl Ca Se C

Ca

Explanation:

Atomic radii vary in a predictable way across the periodic table.  As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period.  Thus, helium is the smallest element, and francium is the largest.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.