The element with atomic number 20 will be found in group

Explanation

To determine the group of the element with atomic number 20, we can follow these steps:

### Step 1: Identify the Atomic Number
The atomic number given is 20. This means the element has 20 protons and, in a neutral atom, also 20 electrons.

### Step 2: Determine the Electronic Configuration
We need to write the electronic configuration of the element. The electronic configuration is determined by filling the electron shells according to the maximum capacity of each shell:
- K shell can hold a maximum of 2 electrons.
- L shell can hold a maximum of 8 electrons.
- M shell can hold a maximum of 18 electrons, but we will only fill 10 more electrons (since we already filled 10 in K and L).

So, we fill the shells as follows:
- K shell: 2 electrons (2)
- L shell: 8 electrons (2 + 8 = 10)
- M shell: 10 electrons (10 + 10 = 20)

Thus, the electronic configuration of the element with atomic number 20 is:
\[ \text{1s}^2 \text{2s}^2 \text{2p}^6 \text{3s}^2 \text{3p}^6 \text{4s}^2 \]

### Step 3: Identify the Valence Electrons
The valence electrons are the electrons in the outermost shell (the highest energy level). In this case, the outermost shell is the 4s shell, which contains 2 electrons.

### Step 4: Determine the Group Number
The group number in the periodic table is determined by the number of valence electrons:
- Group 1 has 1 valence electron.
- Group 2 has 2 valence electrons.
- Group 13 has 3 valence electrons.
- Group 14 has 4 valence electrons.
- And so on.

Since the element has 2 valence electrons, it belongs to **Group 2**.

### Final Answer
The element with atomic number 20 is found in **Group 2** of the periodic table.

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