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An element has 2 electrons in its K-shel...

An element has 2 electrons in its K-shell. 8 electrons in L-shell, 13 electrons in M-shell and one electron in N-shell. The element is 

A

Cr

B

Fe

C

V

D

Ti

Text Solution

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The correct Answer is:
To determine the element based on the given electron configuration, we will follow these steps: ### Step-by-Step Solution: 1. **Identify the Electrons in Each Shell:** - K-shell: 2 electrons - L-shell: 8 electrons - M-shell: 13 electrons - N-shell: 1 electron 2. **Calculate the Total Number of Electrons:** - Total electrons = Electrons in K-shell + Electrons in L-shell + Electrons in M-shell + Electrons in N-shell - Total electrons = 2 + 8 + 13 + 1 = 24 electrons 3. **Determine the Atomic Number:** - The atomic number of an element is equal to the total number of electrons in a neutral atom. - Therefore, the atomic number of the element is 24. 4. **Identify the Element:** - Using the periodic table, we can find that the element with atomic number 24 is Chromium (Cr). 5. **Write the Electronic Configuration:** - The expected electronic configuration for Chromium (Cr) is: - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴ - However, the actual electronic configuration of Chromium is: - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵ - This is due to the stability associated with half-filled d-orbitals. ### Final Answer: The element is Chromium (Cr) with atomic number 24. ---
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