Asolution possibly contains k+, pb2+, ag+, fe2+ and/or ni2+. which of the following statements is true about what could be concluded from the fact that the addition of hcl produces a precipitate? ag+ is the only species present. both ag+ and pb2+ are present and no other ions are present. either ag+, pb2+ or both are present. this does not give us any information about the other three ions. only k+, fe2+ or ni2+ could be present in solution.

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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 option a.