Atoms and Molecules Reading

Name:

Date:

📖 Reading Passage: The Building Blocks of Matter

Everything around you is made of tiny particles called atoms. Atoms are so small that millions of them could fit on the period at the end of this sentence! Even though atoms are incredibly tiny, they are the building blocks of all matter in the universe.

An atom has three main parts: protons, neutrons, and electrons. The protons and neutrons are packed tightly together in the center, called the nucleus. The electrons move around the nucleus in areas called electron shells. Think of it like a miniature solar system, with the nucleus as the sun and electrons as planets orbiting around it.

When atoms join together, they form molecules. For example, water is made of two hydrogen atoms and one oxygen atom bonded together. We write this as H₂O. The air you breathe contains oxygen molecules (O₂) made of two oxygen atoms joined together. Some molecules are simple with just a few atoms, while others like DNA can contain millions of atoms!

Different combinations of atoms create different substances. Salt, sugar, plastic, and even your own body are all made of different arrangements of atoms and molecules. Scientists have discovered 118 different types of atoms, called elements, which can combine in countless ways to create everything we see in our world.

🧪 Part 1: Reading Comprehension

1. What are the three main parts of an atom?

Protons, neutrons, and electrons

Nucleus, shells, and molecules

Hydrogen, oxygen, and carbon

Solids, liquids, and gases

2. Where are protons and neutrons located in an atom?

In the electron shells

Moving around the outside

In the nucleus at the center

Scattered throughout the atom

3. What does H₂O represent?

Two water molecules

A water molecule with 2 hydrogen atoms and 1 oxygen atom

Two oxygen atoms and one hydrogen atom

A type of salt molecule

4. According to the passage, how many different types of atoms (elements) have scientists discovered?

Scientists have discovered _______ different types of atoms.

5. What comparison does the author use to help explain the structure of an atom?

✏️ Part 2: Critical Thinking and Writing

6. The passage states that "millions of atoms could fit on the period at the end of this sentence." Why do you think the author included this comparison? What does it help you understand about atoms?

7. Think about something in your classroom (like your desk, pencil, or water bottle). Using what you learned from the passage, explain how that object is made of atoms and molecules. Write at least 3-4 sentences.

8. If you could shrink down to the size of an atom, what do you think it would be like? Describe your imaginary journey in 2-3 sentences.