Phosphate ion (PO₄³⁻)

A compound ion formed when a phosphoric acid molecule releases a proton.

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Nitrogen-dioxide (NO₂)

A reddish-brown toxic gas, very reactive due to its unpaired electron.

Physical and chemical changes The reaction between iron and sulphur (observation)

When two substances are heated, they combine to form a compound.

Calcium carbonate (CaCO₃)

Limestone is a widely and diversely used material.

Red phosphorus

One of the allotropes of phosphorus.

Hexagonal metallic lattice

Metals forming hexagonal metallic lattices are rigid and difficult to machine.

Ammonium ion (NH₄⁺)

A compound ion generated when a proton is added to an ammonia molecule.

Oxygen (O₂) (beginner)

A colourless, odourless gas, an important component of the atmosphere, indispensable to...

The reaction between aluminium and bromine

The halogens and the metals combine to produce bromides.

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