All of the elements in Group 2, of the Periodic Table, give away 2 electrons; this results in them having a valence charge of...?

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

thats a little if u want the answer just look it up on google thats what i do haha : )