EAN of copper in cuprammonium sulphate is:

Cuprammonium sulphate is Tetraamminecopper sulphate.
Effective atomic number of Cu in [Cu(NH3)4]2+ can be calculated as :
EAN = Number of electron in divalent Cu ( atomic number - charge) + number of bonding electron from surrounding ammonia ligand (each contributes an electron pair)
EAN = 27 + 8 = 35

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