Chemistry map

See the patterns behind the table.

Groups explain families. Periods explain rows. Trends connect position to behaviour.

Radius, ionisation energy, electronegativity and metallic character.

Put two elements side by side and reason from their position.

Explore all 18 groups and their member elements.

Explore all 7 periods and how blocks fill.

Fresh questions drawn from the full element notes.

Race the clock and identify as many elements as you can.

Let chance pick your next element.

Memory hooks in both languages.

Study guides

Answers to the questions you actually search.

Plain-language explainers in both languages — why things happen, not just what they are.

The reaction, the equation, and the 2015 discovery that finally explained the bang.

Position, properties, bonding — plus the two-difference answer examiners keep asking for.

Chunk it by families, not by atomic number — with ready-made mnemonics in both languages.

What Chapter 4 actually asks you to know, how exams test it, and a 7-day study plan.

A full outer shell explains almost everything — and the one famous exception.

How to count them from the group number, and how they decide every bond.

Same element, different mass — from hydrogen-1 to carbon-14 dating to uranium-235.

Rows, columns and the s/p/d/f blocks — the table is a map of electron shells filling up.

The periodic trend that predicts bond types — read straight off the table.

It acts like an alkali metal and a halogen at once — the table's most famous odd seat.

Element families

Ten families, from alkali metals to noble gases — each with its own page.

One useful rule

Across a period, nuclear charge rises while electrons are added to the same main shell; down a group, extra shells increase distance and shielding.