Year 8 Science · Unit 2 · Lesson 11
Apply Worksheet
Learning Goals
Order the steps
Number the steps from 1 to 6 to show the correct order for reading information from an element tile. Step 1 = what you do first.
| Order | Step |
|---|---|
| Calculate the number of neutrons (mass number − atomic number) | |
| Read the symbol (1 or 2 letters, first letter always capital) | |
| Find the element tile on the periodic table | |
| Read the mass number from the tile | |
| Find the atomic number (the smaller number, usually shown at the top) | |
| Identify the element's full name |
Compare two
Complete the table to compare Mendeleev's original periodic table with the modern periodic table. Fill in both columns for each feature.
| Feature | Mendeleev's table (1869) | Modern periodic table |
|---|---|---|
| Ordered by | ||
| Number of elements known | ||
| Had gaps for missing elements? | ||
| Can it predict new elements? | ||
| Most useful for |
1. Element X has atomic number 15 and mass number 31. Calculate its neutron count, and state which period and group it belongs to (phosphorus is in Period 3, Group 15).
2. Sodium (Na) and potassium (K) are both in Group 1 of the periodic table. Using what you know about groups, predict one property they are likely to share. Explain your reasoning.
Wrap Up
In one sentence, what was the main idea of this lesson?