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1️⃣ The smallest building block

• An atom is the smallest piece of matter.
• Everything around us is made of atoms:
  • You
  • Air
  • Water
  • Trees
  • Stars

🧠 Easy line:

Atoms are tiny building blocks of everything

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2️⃣ How small is an atom?

• Atoms are super tiny.
• Millions of atoms can fit on the tip of a pencil!
• You cannot see atoms with your eyes.

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3️⃣ Parts of an atom

An atom has three main parts:

🔴 Protons

• Found in the center
• Have a positive (+) charge

⚪ Neutrons

• Found in the center
• Have no charge

🔵 Electrons

• Move around the center
• Have a negative (–) charge

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4️⃣ What is the nucleus?

• The center of the atom is called the nucleus.
• It holds protons and neutrons.
• It is very heavy compared to electrons.

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5️⃣ Different atoms make different things

• Atoms join together to form molecules.
• Example:
  • Water = H₂O (2 hydrogen + 1 oxygen atom)
• Different atoms = different materials.

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⭐ Fun facts for kids

• Your body has trillions of atoms
• Atoms are mostly empty space
• Gold atoms are heavier than hydrogen atoms

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🧠 Easy to remember

Atom = tiny building block of matter

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