The trends associated with columns of the periodic table
1. can generally be rationalized based on the
effective nuclear charge and degree of shield-
ing
2. are related to the distance of the orbitals
from the nuclei.
3. are related to the electronegativity of the
atoms.
4. are less important relative to trends asso-
ciated with rows.
5. always increase from bottom to top.

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.

sure im new too!

explanation: