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Mono-atomic ⇒ Ag (Silver) & Ca (Calcium).

Tetra atomic ⇒  P (Phosphorus) & O₃ (Ozone)..
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Elements whose atomicity is TETRA ATOMIC---> Phosphorus, Ozone, Gold, Phospate etc.............. Elements whose atomicity is MONATOMIC----> Helium,Argon, Neon, Krypton, Xenon etc.
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