Question : What will be the atomic number of element X that is placed in period 2 and group 17?
Option 1: 8
Option 2: 7
Option 3: 10
Option 4: 9
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Correct Answer: 9
Solution : The correct answer is 9 .
The atomic number of an element corresponds to the count of protons in its nucleus, while its position on the periodic table is defined by its period (row) and group (column). In Group 17, there are typically 7 electrons in the outermost shell, and an element in the second period has 2 electron shells. Consequently, the electron configuration of this element is 2, 7, leading to an atomic number of 9.
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