An element has its electron configuration as 2, 8, 2. Now answer the following question.
a. What is the atomic number of this element?
b. What is the group of this element?
c. To which period does this element belong?
d. With which of the following elements would this element resemble? (Atomic numbers are given in the brackets)
N(7), Be(4), Ar(18), Cl(17)
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Solution
An element has its electron configuration as 2, 8, 2.
a. The atomic number of this element is 12.
b. The group number of this element is second.
c. This element belongs to third period.
d. This element resembles with Be(2).
Concept: Periods and Electronic Configuration
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