The Periodic Table and Electron Arrangement: Concept Map
≈ 30 minConcept Map
Organise the vocabulary, quantities and relationships into a connected model.
This extension applies that lens specifically to The Periodic Table and Electron Arrangement.
The periodic table arranges elements by increasing atomic number into periods (rows) and groups (columns).
- Elements in the same group have the same number of outer (valence) electrons and so behave chemically alike. Group 1 (e.g. Na) are reactive metals; Group 18 (e.g. Ne) are unreactive noble gases.
- For the first 20 elements, electrons fill shells in the pattern 2, 8, 8: up to 2 in the first shell, then up to 8, then up to 8.
Example: sodium has 11 electrons → arrangement 2, 8, 1. That single outer electron is why sodium is so reactive.
Chemistry — Grade 10 — Concept Map: Write the electron arrangement of an atom with 12 electrons (magnesium), using commas, e.g. 2,8,1.
Chemistry — Grade 10 — Concept Map: Why do all the elements in Group 1 (e.g. lithium, sodium, potassium) behave chemically alike?
Chemistry — Grade 10 — Concept Map: In the periodic table, the horizontal rows are called periods and the vertical columns are called groups. How many outer-shell electrons does an atom with arrangement 2,8,7 have?
Name the original topic being extended by this concept map lesson.
Which statement is the best evidence-led starting point for The Periodic Table and Electron Arrangement: Concept Map?