Which of the following are considered greenhouse gases? select all that apply.
a. argon
b. methane
c. water vapor
d. carbon dioxide

water Vapor, Carbon dioxide and Methane

Explanation: Greenhouse Gases are the gases which are able to trap the heat coming from the sun to the earth in the lowest layer of atmosphere.

Sun emits Infrared Radiations and these are trapped by these gases and these rays or radiations are harmful to the living being which can cause hazardous diseases to them. Thus these are being trapped under the effect known as Greenhouse Effect.

Thus Methane, Water Vapor, Carbon Dioxide along with Nitrous Oxide and CFCs are the considered as Greenhouse Gases.

a. they are both space stations

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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.