📚 Part 1: Multiple Choice

1. What is the smallest unit of matter that retains the properties of an element?

Molecule

Atom

Compound

Ion

2. Which scientist is credited with developing the first atomic theory in the early 1800s?

Ernest Rutherford

J.J. Thomson

John Dalton

Niels Bohr

3. According to Dalton's atomic theory, atoms of the same element are:

Always different in mass

Identical in mass and properties

Only identical in color

Constantly changing shape

4. Which of the following are subatomic particles? (Check all that apply)

Protons

Neutrons

Electrons

Photons

✏️ Part 2: Fill in the Blanks

5. Complete the following statements about atomic theory:

a) All matter is made up of tiny, indivisible particles called __________.

b) Atoms of different elements have different __________ and __________.

c) In chemical reactions, atoms are __________, not created or destroyed.

d) The center of an atom is called the __________, which contains protons and neutrons.

6. Explain why Dalton's atomic theory was important for the development of chemistry:

🔬 Part 3: Application

7. A student claims that when wood burns, atoms are destroyed because the wood disappears. Use atomic theory to explain why this claim is incorrect:

8. Draw a simple model of an atom and label the nucleus, protons, neutrons, and electrons:

Introduction to Atomic Theory

Introduction to Atomic Theory

📚 Part 1: Multiple Choice

✏️ Part 2: Fill in the Blanks

🔬 Part 3: Application

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