🧪 Part 1: Historical Knowledge

1. Who is credited with creating the first organised periodic table?

Albert Einstein

Dmitri Mendeleev

Isaac Newton

Marie Curie

2. What was special about Mendeleev's original periodic table?

He left gaps for undiscovered elements

He arranged elements by atomic mass

He predicted properties of missing elements

He only included metals

3. Fill in the blanks about Mendeleev's contribution:

Dmitri Mendeleev arranged elements by increasing _____________ and noticed that element properties showed _____________ patterns. When he found gaps in his table, he predicted that _____________ elements would be discovered to fill these spaces.

🔬 Part 2: Modern Periodic Table Organisation

4. How is the modern periodic table organised?

By atomic mass

By atomic number

By element name

By discovery date

5. What is atomic number?

6. Match the periodic table terms with their definitions:

1. Groups

2. Periods

3. Atomic Number

4. Elements

A. Horizontal rows in the periodic table

B. Pure substances made of one type of atom

C. Vertical columns in the periodic table

D. Number of protons in an atom

⚛️ Part 3: Element Properties and Groups

7. Elements in the same group (column) have:

The same atomic number

Similar properties

The same atomic mass

Different numbers of protons

8. Which of these are major categories of elements? (Select all that apply)

Metals

Non-metals

Noble gases

Liquid elements

9. Complete the sentence about the periodic table's organisation:

The periodic table is arranged from left to right and top to bottom by increasing _____________. Elements are placed in _____________ (columns) based on similar properties and _____________ (rows) based on the number of electron shells.

🎯 Part 4: Understanding and Application

10. Why is the periodic table important for scientists?

11. Draw a simple diagram showing how elements are arranged in the first 3 periods and 3 groups of the periodic table. Label the groups (columns) and periods (rows).

12. Explain in your own words how Mendeleev's work was like being a "scientific detective":

13. Reflection: Which element would you most like to learn about and why?