Answer :

(a) The element placed in 2nd Group and 3rd Period of the Periodic Table is Magnesium (Mg).


(b) Electronic configuration: 1s2, 2s2 2p6 3s2


K, L, M


2, 8, 2


(c) When the magnesium metal burns in oxygen, it produces magnesium oxide.


2Mg(s) + O2(g) 2MgO(s)


When magnesium oxide is heated with water, magnesium hydroxide is formed.


(d) MgO(s) + H2O(l) Mg(OH)2(aq)


Electron dot structure:



Magnesium loses two electrons and oxygen gains two electrons to complete the octet structure.


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