Question

valency of magnesium carbonate​

Answer 1

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Valency means ability of atom/element to lose, gain or shared electrons. In case of MgCO3, Mg (z=12) tends to lose its two valence electrons so its valency becomes 2 and CO3 has ability to gain two electrons so its valency becomes also 2. So overall valency of Mg and CO3 which are present in the form MgCO3, is 2.

Answer 2

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ᴠᴀʟᴇɴᴄʏ ᴏғ ᴍᴀɢɴᴇsɪᴜᴍ ᴄᴀʀʙᴏɴᴀᴛᴇ :-

Vᴀʟᴇɴᴄʏ ᴍᴇᴀɴs ᴀʙɪʟɪᴛʏ ᴏғ ᴀᴛᴏᴍ/ᴇʟᴇᴍᴇɴᴛ ᴛᴏ ʟᴏsᴇ, ɢᴀɪɴ ᴏʀ sʜᴀʀᴇᴅ ᴇʟᴇᴄᴛʀᴏɴs. Iɴ ᴄᴀsᴇ ᴏғ MɢCO➌, Mɢ (ᴢ=➊➋) ᴛᴇɴᴅs ᴛᴏ ʟᴏsᴇ ɪᴛs ᴛᴡᴏ ᴠᴀʟᴇɴᴄᴇ ᴇʟᴇᴄᴛʀᴏɴs sᴏ ɪᴛs ᴠᴀʟᴇɴᴄʏ ʙᴇᴄᴏᴍᴇs ➋ ᴀɴᴅ CO➌ ʜᴀs ᴀʙɪʟɪᴛʏ ᴛᴏ ɢᴀɪɴ ᴛᴡᴏ ᴇʟᴇᴄᴛʀᴏɴs sᴏ ɪᴛs ᴠᴀʟᴇɴᴄʏ ʙᴇᴄᴏᴍᴇs ᴀʟsᴏ ➋. Sᴏ ᴏᴠᴇʀᴀʟʟ ᴠᴀʟᴇɴᴄʏ ᴏғ Mɢ ᴀɴᴅ CO➌ ᴡʜɪᴄʜ ᴀʀᴇ ᴘʀᴇsᴇɴᴛ ɪɴ ᴛʜᴇ ғᴏʀᴍ MɢCO➌, ɪs ➋.

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