The period to which elements with atomic number 36 belongs is

Explanation

To determine the period to which the element with atomic number 36 belongs, we can follow these steps:

### Step 1: Identify the Atomic Number
The atomic number given is 36.

### Step 2: Determine the Element
The element with atomic number 36 is Krypton (Kr).

### Step 3: Find the Electronic Configuration
To find the electronic configuration of Krypton, we need to fill the electron shells according to the Aufbau principle. The order of filling is as follows:
1. K shell (2 electrons)
2. L shell (8 electrons)
3. M shell (18 electrons)
4. N shell (up to 8 electrons for Krypton)

Filling these shells:
- K shell: 2 electrons
- L shell: 8 electrons
- M shell: 18 electrons (but Krypton only needs 6 more to reach 36)

Thus, the electronic configuration of Krypton is:
\[ \text{1s}^2 \text{2s}^2 \text{2p}^6 \text{3s}^2 \text{3p}^6 \text{4s}^2 \text{3d}^{10} \text{4p}^6 \]

### Step 4: Count the Electron Shells
In the electronic configuration, we see that there are 4 energy levels (or shells) being filled:
- 1st shell (K)
- 2nd shell (L)
- 3rd shell (M)
- 4th shell (N)

### Step 5: Determine the Period
The number of filled shells corresponds to the period number in the periodic table. Since there are 4 filled shells, Krypton belongs to the 4th period.

### Final Answer
The period to which the element with atomic number 36 (Krypton) belongs is the **4th period**.

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