The element with electronic configuration `3d^(5)4s^(1)` is

Options

A. metalloid
B. non-metal
C. transition element
D. metal

Explanation

To determine the element with the electronic configuration `3d^(5)4s^(1)`, we can follow these steps:

### Step 1: Identify the total number of electrons
The electronic configuration `3d^(5)4s^(1)` indicates that there are a total of 6 electrons in the outer shell (5 from the 3d subshell and 1 from the 4s subshell).

### Step 2: Determine the period and group
- The `3d` subshell corresponds to the third energy level (n=3), and the `4s` subshell is filled before the `3d` subshell.
- Elements in the d-block are typically transition metals, which are found in groups 3 to 12 of the periodic table.

### Step 3: Identify the specific element
- The element with the configuration `3d^(5)4s^(1)` has a total of 26 electrons (5 from 3d and 1 from 4s, plus the 18 from the filled lower shells).
- The atomic number 26 corresponds to Iron (Fe).

### Step 4: Classify the element
- Iron (Fe) is classified as a transition metal because it has a partially filled d-orbital (3d subshell).

### Conclusion
The element with the electronic configuration `3d^(5)4s^(1)` is Iron (Fe), which is a transition element.