Universe 3. According to general relativity, the initial state of the universe, at the beginning of the Big Bang, it is a
location where the quantities that are used to measure the gravitational field become Infinite in a way
that does not depend on the coordinate system, like black holes

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.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

you need to stop taking that class