What are the symbol formulae of barium oxide, rubidium nitride, and magnesium chloride?

Md Ariful Islam

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Md Ariful Islam

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And then consider the position of the gegenion, to get the charge of the non-metal.

$A.$ $"Barium and oxygen"$; barium is in Group 2, and tends to form $Ba^(2+)$ ions. Oxygen is in Group 16, and tends to form $O^(2-)$ ions as its oxide. $BaO$ is the likely formula.

$B.$ $"Rubidium and nitrogen"$; barium is in Group 1, and exclusively forms $Rb^(+)$ ions. Nitrogen is in Group 15, and tends to form $N^(3-)$ ions as its nitride. $Rb_3N$ is the likely formula.

$C.$ $"Magnesium and chlorine"$; magnesium is in Group 2, and tends to form......... Chlorine is in Group 17.............You tell me the formula?

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