# Periods in Periodic Table (Explained with Images)

Periods in periodic table are the horizontal rows on the periodic table. There are a total 7 horizontal rows on the periodic table, that means the periodic table has 7 periods.

• Period 1: Shortest period (having 2 elements)
• Period 2 and 3: Short period (having 8 elements each)
• Period 4 and 5: Long period (having 18  elements each)
• Period 6 and 7: Longest period (having 32 elements each)

Let’s discuss each of these periods of periodic table one by one.

## Period 1: Shortest period

The 1st period of the periodic table is known as the shortest period.

Period 1 is the shortest period because it has only 2 elements in it.

The number of shell present in the period 1 elements is 1.

Elements of period 1 are given in the table below.

Period 1 elements:

## Period 2 and 3: Short period

The 2nd period and the 3rd period of the periodic table are known as the short periods.

Period 2 and period 3 are the short period because they have 8 elements in it.

Period 2 elements have 2 energy shells while period 3 elements have 3 energy shells.

Elements of period 2 and period 3 are given in the tables below.

Period 2 elements:

Period 3 elements:

## Period 4 and 5: Long period

The 4th period and the 5th period of the periodic table are known as the long periods.

Period 4 and period 5 are the long period because they have 18 elements in it.

Period 4 elements have 4 energy shells while period 5 elements have 5 energy shells.

Elements of period 4 and period 5 are given in the tables below.

Period 4 elements:

Period 5 elements:

## Period 6 and 7: Longest period

The 6th period and the 7th period of the periodic table are known as the longest periods.

Period 6 and period 7 are the longest period because they have 32 elements in it.

Period 6 elements have 6 energy shells while period 7 elements have 7 energy shells.

Elements of period 6 and period 7 are given in the tables below.

Period 6 elements:

Period 7 elements:

## External resources:

1. Period | chemistry. (n.d.). Encyclopedia Britannica. https://www.britannica.com/science/period-chemistry
2. Period (periodic table) – Wikipedia. (2008, February 5). Period (Periodic Table) – Wikipedia. https://en.wikipedia.org/wiki/Period_(periodic_table)
3. 6.4: Modern Periodic Table- Periods and Groups. (2016, June 24). Chemistry LibreTexts. https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/06%3A_The_Periodic_Table/6.04%3A_Modern_Periodic_Table-_Periods_and_Groups