Valence electrons calculator with steps - Easy to use

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A valence electron calculator is an online tool that will help you to find the valence electrons for any atom right away. Valence electrons lie farthest away from the atomic nucleus therefore these electrons experience the least force of attraction from an atom’s positively charged nuclear center.

Valence electrons Calculator

Note: This calculator only works for S and P block elements. Please do not use this valence electron calculator for d and f block element, the data provided for these element in this calculator is wrong.

Please look at this article to find the valence electrons for transition metals (d-block elements).


How to use the Valence electron calculator?

In three steps, you can get valence electrons for any element, let’s see how it works.

  • Enter the name or symbol of the atom in the given blank box.
  • Click the submit button
  • After submission, the result will be shown to you.

For example –

Let’s say you have to calculate valence electrons in nitrogen.

⇒ Enter either the Nitrogen or the “N” symbol in the given empty box of the Valence electron calculator.

step 1 for using valence electron calculator

⇒ Click the submit button

step 2 for using valence electron calculator

⇒ The “valence electron calculator” will calculate the number of the valence electron in the Nitrogen atom and you will get your answer.

step 3 for using valence electron calculator

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How to Calculate Valence electrons?

The Periodic Table is a tabular display of chemical elements, arranged in ascending order of atomic numbers. It consists of vertically arranged groups and horizontal rows called periods.

There are a total of 18 groups and 7 periods in the Periodic Table. The elements situated in groups (1, 2, and 13-18) are called main-group elements. Groups 1 and 2 of the Periodic Table together make an s-block. On the other hand, the block comprised of groups (13-18) is called a p-block.

how to calculate valence electrons

For main-group elements, valence electrons can be determined from their position in the Periodic Table i.e., their group number and/or the electronic configuration of elements.

However, valence electrons are not always the electrons present in the outermost shell. All the elements lying in groups (3-12) constitute another block in the Periodic Table called a d-block. These d-block elements are transition metals that exhibit a variable valency.

Thus, the valence electrons of d-block elements, unlike the s and p blocks, do not exist in the outermost shells only. Rather, their valence electrons can be present in the inner/ core shells as well.

Hence, we need to consider a lot of different ways when finding the valence electrons of a specific chemical element from the Periodic Table.

For instance, Let’s check the number of valence electrons in the most common atoms.

Atomic numberName of the ElementsNumber of valence electrons
1Hydrogen Valence electrons1
2Helium Valence electrons2
3Lithium Valence electrons1
4Beryllium Valence electrons2
5Boron Valence electrons3
6Carbon Valence electrons4
7Nitrogen Valence electrons5
8Oxygen Valence electrons6
9Fluorine Valence electrons7
10Neon Valence electrons8
11Sodium Valence electrons1
12Magnesium Valence electrons2
13Aluminum Valence electrons3
14Silicon Valence electrons4
15Phosphorus Valence electrons5
16Sulfur Valence electrons6
17Chlorine Valence electrons7
18Argon Valence electrons8
19Potassium Valence electrons1
20Calcium Valence electrons2

Also read: How to find valence electrons of any atom or compound?

How to calculate the Valence electrons using a Periodic table?

 The position of a chemical element in the Periodic Table gives a major hint in determining that element’s valence electrons. 

Periodic table

For the S and P block elements, the number of valence electrons is equal to the group number in which the element is situated.

For examples –

  • Lithium (Li) is present in group 1, and it has 1 valence electron. Similarly,
    all the elements present in group 1 have a single valence electron only.
  • Magnesium (Mg) and calcium (Ca) are both present in group 2 and have 2 valence electrons each. Similarly, all the elements present in group 2 have two valence electrons only.

Now, P-block contains the group 13, 14, 15, 16, 17, and 18. These groups are also written as – Group 13 or 3A, Group 14 or 4A, Group 15 or 5A, Group 16 or 6A, Group 17 or 7A, and Group 18 or 8A.

The valence electrons for P-block is also found by the same method as S-block. Just look at the Group number of element = it is equal to the number of valence electrons.

For example-

  • The boron atom belongs to Group 3A, hence, the number of valence electrons in the boron atom is 3.
  • Same, the oxygen atom belongs to Group 6A, hence, the number of valence electrons in the oxygen atom is 6.

how to find calculate valence electrons from periodic table

That’s all, just remember the Group number of S and P-block elements, and calculate their valence electrons.

Block Periodic table GroupNumber of valence electrons
S-BlockAlkali metals – Group 1 (I)1
S-BlockAlkaline earth metals – Group 2 (II)2
P-BlockBoron group – Group 13 or 3A3
P-BlockCarbon group – Group 14 or 4A4
P-BlockNitrogen group – Group 15 or 5A5
P-BlockOxygen group – Group 16 or 6A6
P-BlockHalogens – Group 17 or 7A7
P-BlockNoble gases – Group 18 or 8A8


How do Valence electrons counter work?

The valence electrons counter also called the Valence electron calculator, it is a simple online tool that helps you to find the number of valence electrons for any atom.

How to use a valence electron calculator?

It’s very easy – Put the “Name of element” or the “symbol of the atom” in the blank box of the valence electron calculator widget, then Click on submit, A pop-up will appear and evaluate the valence electron for the given element.

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About the author

Vishal Goyal is the founder of Topblogtenz, a comprehensive resource for students seeking guidance and support in their chemistry studies. He holds a degree in B.Tech (Chemical Engineering) and has four years of experience as a chemistry tutor. The team at Topblogtenz includes experts like experienced researchers, professors, and educators, with the goal of making complex subjects like chemistry accessible and understandable for all. A passion for sharing knowledge and a love for chemistry and science drives the team behind the website. Let's connect through LinkedIn:

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