Question

why is Astatine(At) Smaller than Potassium (K) ? i want genuine answer for my preparation plz don't write rubbish or i will report​

Answer 1

Answer:

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Sadness can be normal, and is only an indicator of underlying disease when feelings become excessive, all-consuming and interfere with daily living.

Answer 2

the mass of astatine 210 u.

the mass of potassium 39.0983 u.

This is the reason