Which factor has the greatest effect on the melting point of a crystalline solid? the type of crystal system that the particles form

the density of the solid (mass per unit volume)

the sizes of the particles that make up the crystal

the type of bonding among the particles​

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.

the answer is b & c i believe : )

you didnt put any of the following

the answer is c.the valence of the atoms combine .