Atoms

Hamza Ahmed
Flashcards by Hamza Ahmed, updated more than 1 year ago
Hamza Ahmed
Created by Hamza Ahmed over 4 years ago
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These are flashcards on atoms. Hope you enjoy.
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Atoms By: Hamza Ahmed Yr 8
Where does the word 'atom' come from? It comes from 'atomos', a word used by Democritus to describe the smallest particles of matter that could not be divided.
What is a scientific model? A simplified idea that can be used to help make predictions or test assumptions.
Who developed the atomic theory of matter? John Dalton
What is the atomic theory of matter? 1. Each element is composed of atoms 2. All atoms of a given element are the same 3. Atoms can't be created or destroyed but can be rearranged to form different substances 4. Compounds are made up of more than one type of atom
What are atoms made up of? Subatomic particles
What are the subatomic particles? Protons, neutrons, electrons
How do these particles make up an atom? The protons and the neutrons are at the centre in the nucleus while the electrons form a cloud around the nucleus.
Why are the electrons bound to the nucleus? They have a negative charge and the protons have a positive charge.
What is the total charge of an atom? Zero
Why? The number of protons and electrons are the same
What is the charge of protons? Positive
What is the charge of electrons? Negative
What is the charge of neutrons? Neutral
Atomic number The number of protons in an atom
Mass number The number of protons and neutrons in an atom
What determines a type of atom? The number of protons in it
What symbol calculates the number of protons, neutrons and electrons in an atom? The 7 represents the mass number and the 3 represents the atomic number
How do you calculate the number of protons in an atom? Looking at the atomic number
How do you calculate the number of electrons in an atom? It is the same as the protons because the charge of the atom is the same
How do you calculate the number of neutrons in an atom? Mass number - atomic number
What are electron shells? The structure of the electron cloud
How many layers are there? 3
How many electrons can they each hold? 1st=2 2nd=8 3rd=18
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