Nitrogen and nitrogen cycle

NITROGEN CYCLE

Raveena Raphi

Nitro• an essential part of the amino acids. It is a

basic element of life.

gen

n + es‘‘nitre forming’’

• composes about four-fifths (78.03 percent) by volume of the atmosphere.

•in the form of protein is an important constituent of animal tissue.• is an important element in plant nutrition.•is inert and serves as a diluent for oxygen in burning and respiration processes.

Position in Periodic Table• It is placed in the p-block .• It belongs to the 15th group.

Electronic Configuration Diagram

Properties of Nitrogen

• Colourless, Odourless gas.• Slightly soluble in water.• Chemically unreactive at ordinary

temperature.

Inference

• Symbol• Atomic Number• Atomic mass• Electronic Configuration• Valency• Physical state• Colour

N7142,53GasColourless

Nitrates through lightning-Nitrogen Fixation

• During lightning nitrogen in atmosphere combines with O2 to form nitric oxide(NO).

• Ie, at high temparatures. N2 + O2 2NOWhen this combine with more O2, what happens? 2NO + O2 2NO2

• NO2 dissolves in water to form nitric acid, and reaches the soil.

• And changes to nitrate salt.• Root plants take up these nitrate salt.• And converted into aminoacids, which unite to

form plant proteins.• Nitrogen fixation can also be carried by certain

bacteria.

Organic Wastes for the growth of plants

• Vermi compost• Green Manure• Bone meal• Ash• Cowdung• Fish manure…… These all contains ammonia

Ammonia

• Chemical formula : NH3• Density : Less than air• Smell : Pungent Smell• Colour : Colourless

Nitrogen Cycle