Question

first element in 4th period is ​

Answer 1

Answer:

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Explanation:

Potassium. Potassium (K) is an alkali metal, placed under sodium and over rubidium, and is the first element of period 4. It is one of the most reactive elements in the periodic table, therefore usually only found in compounds.

Answer 2

Answer:

Potassium is the first elementary in the 4th period

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