The modern periodic table consists of 18 groups and 7 periods. what is the atomic number of the element placed in the 1st group and the 4th period
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4th period so,4 shells.
Then,it will be 2,8,8,1
So the atomic number is 19.
Hence,the element is potassium(K).
Then,it will be 2,8,8,1
So the atomic number is 19.
Hence,the element is potassium(K).
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Answer:
Explanation:
which period
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