KCET · Chemistry · Classification of Elements and Periodicity in Properties
An element with atomic number 21 is a
- A halogen
- B representative element
- C transition element
- D alkali metal
Answer & Solution
Correct Answer
(C) transition element
Step-by-step Solution
Detailed explanation
The electronic configuration of element with atomic number 21 is
\[
1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{2}, 3 \mathrm{p}^{6}, 4 \mathrm{~s}^{2}, 3 \mathrm{~d}^{1}
\]
Since this element contains partly filled orbital, so it is a -block element. -block elements are also known as transition elements.
\[
1 \mathrm{~s}^{2}, 2 \mathrm{~s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{~s}^{2}, 3 \mathrm{p}^{6}, 4 \mathrm{~s}^{2}, 3 \mathrm{~d}^{1}
\]
Since this element contains partly filled orbital, so it is a -block element. -block elements are also known as transition elements.
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