NCERT Book Class 9 Science (Exploration) Chapter 8 Journey Inside the Atom

Chapter
Journey Inside
8 the Atom

House Human Body

P

C H
Room
Organ
Atoms O

Si

N

Wall Tissue

Brick Cell

Silicates Protein

Think It Over Grade 8 Everything that you see or observe, or feel around is
Curiosity

y Are atoms the Chapter 7matter. You have learnt that matter consists of tiny
smallest indivisible particles called atoms. Take a closer look at the picture
particles? given above. What do you observe? Do you notice that both living
y Why do electrons beings, like us, and non-living things, like a house, are ultimately
not fall into the composed of atoms? These atoms are so tiny that they cannot be
nucleus even seen with the naked eye.
though they
You may be wondering — Is an atom truly the smallest unit of
are attracted to
protons in it? matter, or can it be divided even further?
y Why did scientists Scientists, too, have been exploring whether atoms are divisible.
keep modifying If so, what are their constituents and how are these arranged?
atomic models? Let us examine how the concept of atoms emerged and how it has
been evolved since then.