## What are the electronic configuration of first 20 elements?

List of Electron Configurations of Elements

NUMBER ELEMENT ELECTRON CONFIGURATION
18 Argon [Ne]3s23p6
19 Potassium [Ar]4s1
20 Calcium [Ar]4s2
21 Scandium [Ar]3d14s2

## What is the Valency of 1 to 20 elements?

Valency Chart of Elements (first thirty)

Element Atomic Number Valency
Chlorine 17 1
Argon 18 0
Potassium 19 1
Calcium 20 2

How do you find the electronic configuration of an element?

To calculate an electron configuration, divide the periodic table into sections to represent the atomic orbitals, the regions where electrons are contained. Groups one and two are the s-block, three through 12 represent the d-block, 13 to 18 are the p-block and the two rows at the bottom are the f-block.

### What is the Valency of first 20 elements?

The Valency of First 20 Elements

Element Symbol Valency
Hydrogen H 1
Helium He 0
Lithium Li 1
Beryllium Be 2

### How do you find the Valency of 20 elements?

Valency of first 20 elements is given below.

1. Hydrogen (H) = 1.
2. Helium (He) = 0.
3. Lithium (Li) = 1.
4. Beryllium (Be) = 2.
5. Boron (B) = 3.
6. Carbon (C) = 4.
7. Nitrogen (N) = 3.
8. Oxygen (O) = 2.

What is 1 on the periodic table?

The Elements, sorted by Atomic Number

Atomic Number Symbol Name
1 H Hydrogen
2 He Helium
3 Li Lithium
4 Be Beryllium

## How do you write an electronic configuration?

Writing Electron Configurations. When writing an electron configuration, first write the energy level (the period), then the subshell to be filled and the superscript, which is the number of electrons in that subshell. The total number of electrons is the atomic number, Z.

## How is Valency calculated?

Mathematically we can say that if the outermost shell of an atom contains 4 or less than 4 electrons, then the valency of an element is equal to the number of electrons present in the outermost shell and if it is greater than 4, then the valency of an element is determined by subtracting the total number of electrons …

What is the electronic configuration of the first 30 elements?

Electronic Configuration of First 30 Elements The standard notation for the indication of the electronic configuration of atoms is written in a sequence of the label names of each atomic subshell with the number of electrons assigned to that specific subshell written in superscript. These subshells are made up of atomic orbitals.

### How do you write the electronic configuration of sulfur?

Therefore, the electronic configuration of sulfur can be written as 1s 2 2s 2 2p 6 3s 2 3p 4. The electronic configuration of elements can also be written with the help of noble gases. These noble gases have completely filled outermost shells and can be prefixed to the outermost shell of the element whose electronic configuration must be noted.

### How many electrons are in a 2p configuration?

So, 1s can accommodate 2 electrons, 2s can accommodate 2 electrons, 2p can accommodate 6 electrons (3 orbitals*2 electrons each= 6 electrons) and so on. And filling of the electrons for writing the electronic configuration of the elements is done according to the Aufbau rule, Pauli’s exclusion principle and Hund’s rule.

Why is it important to study the electronic configuration of elements?

The atomic number is the characteristic feature of an atom. The unique distribution of electrons along atomic orbitals is responsible for the element’s specific chemical and physical properties. Therefore, it’s very important to know and study the electronic configuration of all elements.