How did niels bohr describe electrons in his atomic model?

Neils Bohr proposed that an electron is found only in specific circular paths or orbits around the nucleus. Each orbit has a fixed energy and are called energy levels. The nearest electron to the nucleus has the lowest energy level and the farthest is the strongest energy level. The energy of an electron is said to be quantized.

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.