Chemistry
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

d-electrons in Fe(Z = 26)
s-electrons in Mg(Z = 12)
p-electrons in CI(Z = 17)
p-electrons in Ne(Z = 10)

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Chemistry
Antacid tablets consist of

Hydroxides of sodium and aluminium
Hydroxides of magnesium and aluminium
Hydroxides of sodium, magnesium and aluminium
Hydroxides of magnesium and sodium

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