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what is the formula of the compound formed between chlorine (cl) and calcium (ca)?

cacl, because calcium loses one electron and chlorine gains one electron.
clca, because chlorine gains one electron and calcium loses one electron.
cacl2, because calcium loses two electrons and chlorine gains one electron.
clca2, because chlorine gains one electron and calcium loses two electrons.

, because calcium loses two electrons and chlorine gains one electron.

Explanation:

You start with the metal [Ca], then attach the non-metal [Cl]. Then, you have to determine the charges of each element:

Chlorine → Group 17 (Halogens) [−1]

Calcium → Group 2 (Alkaline Earth Metals) [+2]

Now that we have our information, when we write our the formula, going from metal to non-metal, both subscripts swap places:

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the volume of fluid displaced would equal the volume of the gas. use a gas syringe - this is a laboratory instrument that can be used to withdraw a certain volume of gas from a closed system or to measure the volume of gas from a chemical reaction.