Which of the following characteristics differentiates an autotroph from a heterotroph? question options: a heterotroph must obtain its energy from an autotroph or other heterotroph. autotrophs only obtain their energy from the sun. an autotroph can only obtain its energy from a heterotroph. an autotroph must obtain its energy from a heterotroph or other autotroph.. heterotrophs only obtain their energy from the sun. a heterotroph can only obtain its energy from an autotroph.

The option A is correct option.

A heterotroph must obtain its energy from an autotroph or other heterotroph. Autotrophs only obtain their energy from the Sun.

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

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.