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1. Name an element which has the same number of electrons in its first and second shell.
The atomic number of beryllium is .
Electronic configuration is , i.e., K shell-\(2\), L Shell-\(2\).
2. Write the electronic configuration of \(K\) and \(Cl\).
Element | Atomic number | K shell | L shell | M shell | N shell |
| Potassium (\(K\)) | \(2\) | \(8\) | \(1\) | ||
| Chlorine (\(Cl\)) | \(2\) | \(8\) |
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