Q. 425.0( 6 Votes )
An element is pla
(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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