🧪 Part 1: Multiple Choice

1. Which of the following is NOT a state of matter?

Solid

Liquid

Gas

Energy

2. What happens to particles when a solid is heated and becomes a liquid?

They move faster and further apart

They stop moving completely

They get smaller

They change into different particles

3. Elements in the same group of the periodic table have the same number of:

Protons

Neutrons

Electrons in their outer shell

Atomic mass

4. Which of these properties are typical of metals? (Select all that apply)

Good conductors of electricity

Shiny appearance

Brittle when solid

Malleable (can be hammered into shapes)

🔬 Part 2: Matching Activity

5. Match each atomic particle with its correct description:

Proton

Neutron

Electron

Negatively charged, orbits nucleus

Positively charged, found in nucleus

No charge, found in nucleus

✏️ Part 3: Short Answer Questions

6. Complete the following sentence:

The atomic number of an element tells us the number of _____________ in the nucleus, and this is also equal to the number of _____________ in a neutral atom.

7. Explain why ice floats on water, using your knowledge of particle arrangement in different states of matter.

8. Look at the periodic table. Sodium (Na) is in Group 1 and Period 3. What does this tell you about sodium's atomic structure?

9. A student heats water from 20°C to 100°C. Describe what happens to the water particles during this process and explain why the water eventually changes state.

10. Give two reasons why the periodic table is useful to scientists.

Reason 1: _________________________________________________

Reason 2: _________________________________________________