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The valency of ferric is ..................., while that of ferrous is .................
trivalent , divalent
The table salt molecule is formed from combination of ............... positive ion and .............. negative ion.
sodium , chloride
During chemical reaction, oxygen atom can ............... or ........... two electrons.
gain , share with
..................... is a set of different elements joined together and behave like one atom during the chemical reaction.
Atomic group
.......................... is a formula that represents the number and the type of the atoms in a molecule.
Chemical formula
