Atoms: Building Blocks of Everything

Atoms: Building Blocks of Everything

Understanding the Basic Structure of Matter Year 7 Science - UK National Curriculum

What do you think atoms look like?

Draw or describe what you imagine an atom looks like Think about size - how small might they be? What do you think they're made of?

What is an Atom?

The smallest unit of matter that retains properties of an element Everything around us is made of atoms Too small to see with the naked eye About 100 million atoms could fit across your fingernail

The Atomic Model Through History

Parts of an Atom

Nucleus - the center containing protons and neutrons Protons - positively charged particles Neutrons - neutral particles (no charge) Electrons - negatively charged particles orbiting the nucleus.

Comparing Atomic Particles

{"left":"Protons: Positive charge, Found in nucleus, Mass = 1 unit\nNeutrons: No charge (neutral), Found in nucleus, Mass = 1 unit","right":"Electrons: Negative charge, Orbit the nucleus, Very small mass"}

Build an Atom Activity

Work in pairs to create a model atom Use red counters for protons, white for neutrons, blue for electrons Start with a simple atom like Helium (2 protons, 2 neutrons, 2 electrons) Draw your atom and label each part

Atomic Number and Mass Number

Atomic Number = Number of protons in the nucleus This determines what element it is Mass Number = Protons + Neutrons Example: Carbon has 6 protons, so its atomic number is 6

Elements and the Periodic Table

Elements are pure substances made of only one type of atom Each element has a unique atomic number The Periodic Table organizes all known elements Examples: Hydrogen (1 proton), Oxygen (8 protons), Gold (79 protons)

Key Takeaway.

Atoms are the building blocks of everything in the universe. Understanding their structure helps us understand how matter behaves and how elements combine to form compounds.