The representative elements are also called the group a elements. consider these representative elements: li - group 1a c - group 4a cl - group 7a. what does the group number tell us about the electron arrangement of representative elements? a) number of sublevels filled b) number of electrons lost when forming compounds c) number of electrons in the outermost energy level d) number of energy levels in the atoms of each group

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.