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Description
Flashcards by 10stravera, updated more than 1 year ago
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Created by 10stravera
almost 9 years ago
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| Question | Answer |
| Who created the periodic table? | Dmitri Mendeleev |
| What is an atom? | The smallest particle of any element |
| What is a molecule? | A particle made of two or more atoms joined together |
| What is an Element? | a material that contains only one type of atom |
| What is a compound? | a material that contains two or more different elements joined together |
| What is a mixture? | a material that contains two or more chemicals NOT joined |
| What does the number of protons equal? | The number of electrons |
| How do you work out the electron configuration of an atom? | 1. Work out the number of protons, neutrons and electrons (protons = electrons) 2. Draw first shell of atom - only 2 electrons can fit on first shell 3. Draw extra shells until all electrons are on a shell - extra shells can fit a maximum of 8 electrons 4. Count the number of electrons on each shell e.g. 2.8.1 = 11 electrons |
| Define the term 'Isotope' | Isotopes are different atomic forms of the same element, which have the same number of protons but different number of neutrons. |
| What does the Atomic number tell you? | The number of protons in the atom |
| What does the Mass number tell you? | The total number of protons and neutrons in the atom |
| What does the relative atomic mass tell you? | The average mass of the atom, taking account the mass of isotopes |
| What does an atom look like? | It has protons and neutrons in its nucleus and electrons surrounding the nucleus on shells. |
| What is meant by the term 'empirical formula'? | The empirical formula is the simplest ratio of different atoms in a substance |
| Name 5 properties of Metals | 1.Shiny 2.Malleable 3.Strong 4.Ductile 5.Electrical conductor 6.Heat conductor 7.High boiling point 8.Compounds are different colours |
| How do you work out the Relative atomic mass? | 1.Multiply the mass of each isotope by it's relative abundance 2. Add them together 3.Divide by the sum of the relative abundances |
| Name two similarities and differences between Mendeleev's table and the periodic table today | Similarities |
| What is Ionic bonding? | Atoms transfer (lose or gain) electrons to form positively or negatively charged atoms called ions. |
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