What is the periodic table? Why is iron written as Fe?

In one line

The rule

The periodic table is a systematic arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties. (NCERT Class 9)

Each element is given a symbol, usually from its English or Latin name. For iron, the symbol is Fe (from the Latin word 'ferrum').

Let's understand it simply

Imagine you go to a big market. Everything is arranged in a way that makes it easy to find what you need—vegetables in one row, fruits in another, and so on. The periodic table is like this market, but for elements. Each element is put in a special place based on its properties and atomic number (the number of protons in its atom).

Now, think of iron. In school, we call it 'iron', but in the periodic table, it is written as Fe. This is like how your friend Ravi might be called 'Ravi' at home, but his official name on documents is 'Ravindra'. Fe comes from 'ferrum', which is the old Latin name for iron.

How it works

1. Scientists arrange elements in order of their atomic number (number of protons).
2. Elements with similar properties are put in the same column (called a group).
3. Each row (called a period) shows elements with the same number of electron shells.
4. Every element gets a symbol—one or two letters. Most are from English names, but some, like Fe for iron, come from Latin.
5. This arrangement helps us see patterns, like which elements react in similar ways.

The story behind it

The periodic table was first made by Dmitri Mendeleev, a Russian scientist, in 1869. He wanted to organize the elements so that scientists could see patterns and predict new elements. Mendeleev left gaps for elements that were not discovered yet, and later, those elements were found! The symbols for elements were chosen by early chemists. For some elements, they used the Latin names because Latin was the language of science in those days. That's why iron is Fe (ferrum), sodium is Na (natrium), and gold is Au (aurum).

Where you see it in real life

• In the kitchen: The pressure cooker is made of steel, which contains iron (Fe). The periodic table tells us iron is a metal.
• In the market: Aluminium (Al) foil is used to wrap food. Its symbol is Al, from its English name.
• In medicine: Doctors check for iron (Fe) in your blood to see if you have enough haemoglobin.
• In school labs: Copper wires (Cu) are used in circuits. Cu comes from 'cuprum', its Latin name.
• On coins: Some coins are made of nickel (Ni) or zinc (Zn), both found in the periodic table.
• During Diwali: Fireworks use elements like magnesium (Mg) for bright flashes, and each element gives a different colour.

Why it matters

• The periodic table helps chemists predict how elements will react with each other.
• It is used in making medicines, building materials, and even in farming (fertilizers).
• Many entrance exams (like NEET, JEE) have questions on the periodic table.
• Understanding symbols like Fe, Na, and Au helps you read science books and labels easily.

Worked example

Let's find iron (Fe) on the periodic table and see what its details are:

Step 1: Find the symbol Fe on the periodic table.
Step 2: Check its atomic number. Iron has atomic number 26.
Step 3: See which group and period it is in. Iron is in Group 8, Period 4.
Step 4: Note its properties. Iron is a metal, solid at room temperature, and magnetic.

Common mistakes

• Thinking every symbol matches the English name. (Wrong: Sodium is Na, not So.)
• Mixing up groups (columns) and periods (rows). Groups go up and down; periods go left to right.
• Believing the periodic table never changes. New elements can be added when discovered.
• Forgetting that some symbols come from Latin, not English.

Remember it

The periodic table is like a map of elements—Fe stands for iron because of its Latin name, ferrum.