Explain how science can people save resources such as coal

Explanation:

The science and it's associated knowledge can help people to develop and use alternatives of coal as a source of energy. As coal is a non-renewable source of energy and it's use should be judicious so that the future generation may not suffer from scarcity. Thus alternative sources of energy like water, wind and solar energy can be used so as to conserve the coal for future generation. The knowledge of science and technology will help in generation of energy from the alternative sources.  

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.

it's c. elements are placed in rows based on how may valencies electrons have.