2465991
Description
Flashcards by Tom Mitchell, updated more than 1 year ago
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Created by Tom Mitchell
about 9 years ago
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| Question | Answer |
| How did John Dalton describe atoms? | As solid spheres |
| What did J J Thomson concluded from his measurements of charge and mass of atoms? | That an atom must contain negatively charged particles |
| What was J J Thomson's model known as? | Plum Pudding model |
| What theory did Rutherford come up with? | The nuclear atom The atom has a nucleus surrounded by a cloud of negatively charged electrons |
| How did Bohr's Model add to the theory of an atom's structure? | Included the idea that an atom was surrounded by 'shells' of electrons rather than a 'cloud' of electrons |
| What does the nucleus contain? | Protons and neutrons |
| What charge does the nucleus have? | Positive |
| Where is almost the whole mass of the atom held? | In the nucleus |
| What charge do electrons have? | Negative |
| What is the mass of an atom? | |
| What is the radius of an atom | |
| Fill in the blanks | |
| Why do neutral atoms have no charge? | They have an equal number of protons and electrons |
| What is the mass number? | Total number of protons and neutrons |
| What is the atomic number? | The number of protons |
| What does a new period show in the periodic table? | Another full shell of electrons |
| How do the group numbers relate to the number of electrons on the outer shell of the atom? | They are the same e.g. group 1 atoms have 1 electron on their outer shell |
| Why is an atom described as stable if it has an outer shell of 8 electrons? | Its outer shell is full and so is no very reactive |
| What are isotopes and how are they identified? | Different forms of the same element They have the same number of protons but a different number of neutrons |
| What is an ion? | An atom or molecule that has lost or gained an electron to become charged |
| What are ionic bonds formed from? | Metals and non-metals |
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