plz answer this question plz
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first question answer is 4th
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Explanation: Atomic number is 19 which means -duh, its pottasium. Potassium is in period 3. Why? It's electronice configuration (2,8,7) has 3 shells), thus, period 3. Non-metals are the minority elemts seperated from the metal elements by an invisible staircase - which is easy to memorise - on the mordern periodic table.
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