Compare the densities of two objects that have the same volume, but one feels heavier than the other.

Explanation:

Density of a substance is defined as mass divided by its volume.

Mathematically,         Density =

So, density is proportional to the mass of substance. Hence, an increase in mass will lead to increase in density of the substance also.

Whereas density is inversely proportional to volume of a substance. Hence, an increase in volume will lead to a decrease in density of the substance.

So, when densities of two objects that have the same volume, but one feels heavier than the other then it means mass of one object is greater than the other.

Hence, density of one object is greater than the other. That is why, one feels heavier than the other.

i'm assuming that the correct answer is indeed the first one/ "a"..

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.