Lesson focus: The periodic tableA chart of all the elements in order of proton number, with elements that have similar properties in the same column (group). orders elementA substance made of only one type of atom, such as oxygen or iron. by proton numberThe number of protons in an atom, which tells you which element it is. and reveals groupA column going down the periodic table; elements in the same group behave in similar ways. patterns.
Use symbols, groups and periodA row going across the periodic table. to retrieve and predict information.
Build on earlier learning
AtomsUse proton number to understand periodic-table order.
You will be successful when you can…
- Translate names and symbols correctly.
- Define group and period.
- Use proton-number order.
- Make a cautious group-based prediction.
Words that carry the science
- element
- Substance containing one type of atom, defined by proton number.
- chemical symbol
- One- or two-letter shorthand with a capital first letter.
- period
- Horizontal row of the periodic table.
- group
- Vertical column whose elements often share properties.
- proton number
- Number of protons in an atom nucleus.
Read position as organised chemical evidence
01Symbols are exact
C is carbon, Ca is calcium and Co is cobalt. Letter case carries meaning; a symbol identifies an elementA substance made of only one type of atom, such as oxygen or iron., not necessarily one isolated atom.
02Rows and columns encode order
Elements are ordered by increasing proton numberThe number of protons in an atom, which tells you which element it is.. Rows are periodA row going across the periodic table.; columns are groupA column going down the periodic table; elements in the same group behave in similar ways..
03Patterns support predictions
Elements in a groupA column going down the periodic table; elements in the same group behave in similar ways. often have related reactions because of electron arrangement. Predictions should use known evidence and remain testable.
Decode a location
An unknown is in periodA row going across the periodic table. 3 and the same group as lithium.
- Period 3 means third horizontal row.
- Lithium identifies group 1.
- Locate the intersection: sodium.
- Use correct symbol: Na, not NA.
How to make the reasoning visible: Use row and column evidence independently, then combine.
Periodic-table trail
Use a classroom periodic table alongside these clues.
| Clue | Element | Symbol | Location |
|---|---|---|---|
| Proton number 6 | Carbon | C | Period 2, group 14 |
| Symbol Na | Sodium | Na | Period 3, group 1 |
| Group 18, period 2 | Neon | Ne | Noble gas |
| Symbol Ca | Calcium | Ca | Period 4, group 2 |
Why is CA not the symbol for calcium?
What evidence supports similar behaviour within a group?
Use the table. Which element is in group 18, period 2? What type of element is it?
Check your understanding
Answer from memory, then check against the suggested answer.
What is element?
What is chemical symbol?
What is period?
What is a group in the periodic table?
What is the chemical symbol for sodium?
Predict whether an unfamiliar group 1 element is likely to share properties with sodium.
Why does increasing proton number provide a better order than atomic mass alone?
Why is it useful that elements in the same group often react in a similar way?
Exam Question Practice
Exam Question Practice
Mark points shown after marking
Element X is in period 3 and group 1 of the periodic table.
Identify element X and give its symbol.
(2)X is . Its symbol is .
Explain what the period and the group tell you about the position of X.
(2)Total for this question: 4 marks
Command word: For identifyA command word: name or pick out the correct answer, without needing to explain it., give the exact name/symbol, then answer each location part.