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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?

  1. A
    21
  2. B
    17
  3. C
    19
  4. D
    9

Solution & Step-by-step Explanation

The element placed in the 1st group and the 4th period of the modern periodic table is Potassium (K). Its atomic number is 19. The electronic configuration is 2,8,8,1.

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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?
A
21
B
17
C
19
D
9

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ChemistryPeriodic TablePeriodic Classification

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