An element has 13 electrons in its M shell and 1 electron in N shell in ground state. Identify the element.

Options

A. Chromium
B. Iron
C. Manganese
D. Copper

Explanation

To identify the element with 13 electrons in its M shell and 1 electron in its N shell, we can follow these steps:

### Step 1: Understand Electron Shells
The electron shells are labeled K, L, M, N, etc. Each shell can hold a maximum number of electrons:
- K shell can hold a maximum of 2 electrons.
- L shell can hold a maximum of 8 electrons.
- M shell can hold a maximum of 18 electrons.
- N shell can hold a maximum of 32 electrons.

### Step 2: Analyze Given Information
We know that:
- The M shell has 13 electrons.
- The N shell has 1 electron.

### Step 3: Determine Total Electrons
To find the total number of electrons in the atom, we add the electrons in all shells:
- K shell: 2 electrons (maximum)
- L shell: 8 electrons (maximum)
- M shell: 13 electrons
- N shell: 1 electron

Total = 2 (K) + 8 (L) + 13 (M) + 1 (N) = 24 electrons.

### Step 4: Identify the Element
The total number of electrons in a neutral atom is equal to the atomic number. Therefore, the atomic number of the element is 24.

### Step 5: Find the Element with Atomic Number 24
The element with atomic number 24 is Chromium (Cr).

### Conclusion
The element with 13 electrons in its M shell and 1 electron in its N shell is Chromium (Cr).

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