atomic size increases down a main group and decreases across a period. in a transition series, size remains relatively constant.

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.

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tony (lordcaos066)

the answer is c

tell me if wrong

a is the correct answer

plasma - state of matter made up of electrically charged particles