3.1 elements & periodic table
TRANSCRIPT
Dr Pusey
What do you think an atom is? Can you draw what it looks like?
Learning Outcomes
Explain what the structure of an atom looks like
Recall the definition of an Element and provide examples
Identify and locate elements using the Periodic Table
AtomsAtoms are the “building blocks” of all matter
The Nucleus – this contains neutronsand protons
Electrons – these orbit around the nucleus
ElementsElements are pure substances made up of particles (atoms) of the same type.
These are two atoms of Hydrogen
1 Proton0 Neutrons1 Electron
ElementsElements are pure substances made up of particles (atoms) of the same type.
These are two atoms of Helium
2 Protons2 Neutrons2 Electrons
ElementsWhat makes an element an element is the number of protons
• All Hydrogen atoms have 1 proton• All Helium atoms have 2 protons• All Lithium atoms have 3 protons• All Beryllium atoms have 4 protons• And so on…
Scientists have so far found 118 elements –some of these had to be synthetically created!
How good is your memory? You only need to remember the names and symbols of
these elements
The Periodic Table The arrangement is the same, but the colours and
other bits may be different (yours is black and white!)
The arrangement is specific – we will learn more about this over time
Columns form GROUPS
These groups act similarly to others in the same group.
All of the elements on the very right are extremely stable gases called “Noble gases”.
All of the elements on the very left are the opposite – they are very reactive!
Potassium + Water
Label your Periodic Table
How did you go?
Explain what the structure of an atom looks like
Recall the definition of an Element and provide examples
Identify and locate elements using the Periodic Table