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Description
Flashcards by Hamza Ahmed, updated more than 1 year ago
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Created by Hamza Ahmed
over 8 years ago
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| Question | Answer |
| 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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