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An element with atomic number 21 is a
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The correct answer is:
transition element
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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