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4.1 Chemistry
4.1 Atomic structure and the periodic table
| Question | Answer |
|---|---|
| What are all substances made of? | atoms |
| what is the smallest part of an element? | an atom |
| How many elements are there? | Around 118 |
| How are compounds formed? | chemical reactions |
| How are compounds separated? | chemical reactions |
| What is a mixture? | A combination of two or more substances that are not chemically combined |
| How can mixtures be separated? | By filtration, crystallisation, simple distillation, fractional distillation and chromatography. Physically not chemically. |
| What is the charge of a proton? | positive (+1) |
| What is the charge of an electron? | negative (-1) |
| What is the charge of a neutron? | neutral (0) |
| what is the number of electrons equal to? | number of protons |
| Do atoms have a charge? | no, they are neutral |
| What is the atomic number? | number of protons |
| Atoms of __________ elements have different numbers of protons | different |
| All isotopes of an element have the same | atomic number / number of protons |
| what part of the atom contains the most mass | the nucleus |
| What is the relative mass of a proton | 1 |
| what is the relative mass of a neutron | 1 |
| what is the relative mass of a electron | 1/1840 |
| The sum of the protons and neutrons in an atom equals the | mass number |
| Atoms of the same element with different numbers of neutrons are called | isotopes |
| what does the number represent above the atomic symbol? | relative atomic mass |
| what does the number represent below the atomic symbol? | atomic (proton) number |
Created by:
w15aapperley
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