Metals and Non-Metals: quick revision, 15 bites

Metals Lose, Non-Metals Gain

One electron decides everything.

The single biggest difference between metals and non-metals is how they handle electrons during a chemical reaction.

Takeaway. Electron behaviour — losing vs gaining — is the root cause of every other metal/non-metal difference.

What Exactly Are Metals and Non-Metals?

Two families, one periodic table.

Takeaway. Metals and non-metals are defined by a cluster of physical and chemical properties, not a single trait.

Physical Properties: Side-by-Side

Shiny vs dull — spot the difference.

Takeaway. These six properties are the fastest way to identify a metal in an exam question.

Exceptions That Break the Rules

Not every metal behaves like a metal.

Takeaway. Exceptions are favourite exam questions — memorise these five.

How Metals React with Oxygen

Burn, coat, or explode — depends on the metal.

Metals react with oxygen to form **metal oxides**, which are generally **basic** in nature.

Takeaway. Metal oxides are basic; non-metal oxides are acidic — a key contrast.

Oxides: Basic vs Acidic

Litmus tells the whole story.

Takeaway. Metal oxides are basic, non-metal oxides are acidic — a classic exam contrast.

Reactivity Series: Who Displaces Whom

More reactive metals kick out the weaker ones.

The **reactivity series** ranks metals from most to least reactive. A more reactive metal displaces a less reactive metal from its salt solution.

Takeaway. Higher in the series = more reactive = can displace metals below it.

Displacement in Action

Iron nails turn copper-coated.

Takeaway. Displacement reactions are the practical proof of the reactivity series.

Why We Use Metals Everywhere

From wires to wedding rings.

Takeaway. Each metal's use is directly tied to its physical or chemical properties.

Don't Confuse 'Sonorous' with 'Lustrous'

Two shiny words, two different meanings.

Takeaway. Lustre is about appearance; sonority is about sound — never interchange them.

All Metals Are NOT Solid

Mercury breaks the 'solid metal' rule.

Takeaway. Always qualify generalisations about metals — exceptions earn marks.

Mnemonic for the Reactivity Series

One sentence, eight metals.

Use this classic mnemonic to recall the reactivity series from most to least reactive:

Takeaway. A mnemonic locks the order in memory — perfect for quick recall in exams.

How to Score Full Marks on Metal Questions

Structure your answer, structure your marks.

Takeaway. Property + example + equation = a full-mark answer.

Sodium Is Stored in Kerosene

Water-loving metal hides in oil.

Sodium and potassium are so reactive that they catch fire on contact with air or water. They are stored in **kerosene** to prevent accidental reaction.

Takeaway. Highly reactive metals need protective storage — a direct consequence of their reactivity.

Galvanisation: Protecting Iron from Rust

A zinc coat saves iron bridges.

Iron rusts when exposed to moist air. Coating it with a layer of **zinc** — called **galvanisation** — prevents rusting because zinc reacts with oxygen first, forming a protective layer.

Takeaway. Galvanisation uses the reactivity series to protect iron — chemistry in everyday life.