Write the electronic configuration of the elements given below and predict their period, group, block and also name the class, i.e., representative, transition etc. to which they belong.
`""_(40)B`

Explanation

To solve the question regarding the element with atomic number 40 (Zirconium, Zr), we will follow these steps:

### Step 1: Identify the Element
The atomic number 40 corresponds to the element Zirconium (Zr).

### Step 2: Write the Electronic Configuration
To write the electronic configuration, we need to fill the atomic orbitals according to the Aufbau principle, Hund's rule, and the Pauli exclusion principle. The order of filling is as follows:

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