Question

An element 'A' has two valence electrons and total
twelve electrons in it while another element 'B' has
six electrons in its valence shell and total eight
electrons and form the compound AB. The element
A when reacts with steam, evolves a gas 'C'.
Identify 'A', 'B' and 'C' and write its equation.​

Answer 1

Answer:

A=Magnesium, B= Oxygen, C= H(2) gas

Explanation:

As you know that Magnesium has 2 electrons in valence shell. It is a metal and tends to lose electrons. The element B is Oxygen. It has 6 electrons in it's valence shell. It is a non metal and tends to gain electrons. Both element A and B react to give MgO (Magnesium oxide). When the element A reacts with steam( water H2O) it forms MgO (Magnesium oxide) and produce the gas C which is H2(hydrogen gas).

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