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💡 Think it over
A house, a wall, your own body — everything is built from atoms too small to see. But is the atom really the smallest thing, or can we go deeper inside it?
In this chapter we will learn about how the idea of the atom grew, the tiny particles inside it (electrons, protons and neutrons), how they are arranged, and ideas like atomic number, mass number, valency, isotopes and isobars.
❓ Think It Over
- Are atoms the smallest indivisible particles?
- Why do electrons not fall into the nucleus even though they are attracted to protons in it?
- Why did scientists keep modifying atomic models?
Journey
A step-by-step story of how scientists slowly discovered what an atom is.
Inside
We go deep into the atom to meet the particles hidden within it.
Atom
The tiny unit made of a nucleus (protons + neutrons) with electrons around it.
Topics We Will Study
8.5
Atomic Number
8.6
Mass Number
