, or DDT, was a pesticide used extensively during the 1940s and 1950s. While nearly eliminating malaria in much of the world, widespread agricultural usage of DDT lead to a drastic reduction in bird populations, particularly birds of prey like bald eagles and osprey

Kindly check the explanation section.

Explanation:

The chemical compound known as DDT with full name is synthesized through the reaction of chlorobenzene with CCl3CHO. It has the molecular weight of 354.49 g/mol, melting point of 108.5°C and boiling point of 260°C.

It is used in the prevention of malaria and pesticide before it was banned in the United States and several other countries as it poses health hazards to animals such as birds and to human beings by affecting the nervous system.

As was used in the eradication of malaria it killed many birds and animals at that time and it was also researched that it is potent and harmful to human beings.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

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