To which element does the following electronic configuration correspond ?
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(1)`

Answer

To determine which element corresponds to the given electronic configuration `1s^(2)2s^(2)2p^(6)3s^(2)3p^(1)`, we can follow these steps:

### Step 1: Count the total number of electrons
The electronic configuration can be broken down as follows:
- `1s^(2)` contributes 2 electrons
- `2s^(2)` contributes 2 electrons
- `2p^(6)` contributes 6 electrons
- `3s^(2)` contributes 2 electrons
- `3p^(1)` contributes 1 electron

Now, we sum these contributions:
\[ 2 + 2 + 6 + 2 + 1 = 13 \]

### Step 2: Identify the atomic number
The total number of electrons in a neutral atom is equal to its atomic number. Therefore, the atomic number of the element is 13.

### Step 3: Locate the element in the periodic table
Now that we know the atomic number is 13, we can look at the periodic table to find the element with atomic number 13.

### Step 4: Determine the element
The element with atomic number 13 is Aluminium (Al).

### Step 5: Classify the element
From the electronic configuration, we can also determine:
- The last shell is the third shell (n=3).
- The last subshell is `p` with one electron, indicating that it is a p-block element.
- Since it is in the third period and has one electron in the outermost shell, it belongs to Group 13.

### Final Answer
Thus, the element corresponding to the electronic configuration `1s^(2)2s^(2)2p^(6)3s^(2)3p^(1)` is Aluminium (Al).

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