An element has configuration 2, 8, 1. It belongs to, _.
Correct answer: A. IA group and 3rd period
- A. IA group and 3rd period
- B. IIIA group and 1st period
- C. IA group and 8th period
- D. VIIA group and 3rd period
Explanation
Elements' position in the periodic table can be determined by its electronic configuration. Period can be determined by counting the number of shells its electrons occupy. Since the element shown occupies three shells so we can say that it is in Period III. Group can be determined number of electrons in the last shell. Since the element has 1 electron in its last shell so the group number of this element is 1.Hence the answer is A.
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