Question

ᴠᴀʟᴇɴᴄʏ ᴏғ ᴍᴀɢɴᴇsɪᴜᴍ?*~•​

Answer 1

Answer:

Magnesium (Atomic number = 12) has electronic configuration 2, 8, 2. It loses 2 electrons to complete octet configuration in its valence shell. Chlorine (Atomic number = 17) has electronic configuration 2, 8, 7. It gains 1 electron to complete octet configuration in its valence shell.

Answer 2

Answer:

Answer</p><p>

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.