5193579
Description
Flashcards by Anisha Rai, updated more than 1 year ago
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Created by Anisha Rai
over 8 years ago
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| Question | Answer |
| What is an element? | A substance that is made of only one type of atom |
| What do groups in the periodic table show? | Elements with similar properties |
| Describe structure of an atom | Small central nucleus which is made up of protons and neutrons and around which there are electrons |
| What is the relative electrical charge of protons? | +1 |
| What is the relative electrical charge of neutrons? | 0 |
| What is the relative electrical charge of electrons? | -1 |
| In an atom, what is the number of electrons equal to? | The number of protons in the nucleus |
| Do atoms have an overall electrical charge? | No |
| What is the atomic number of an element? | The number of protons |
| What is the mass number of an element? | The sum of protons and neutrons in an atom |
| What do all atoms of a particular element have the same number of? | Protons |
| What are isotopes? | Atoms of the same element with different numbers of neutrons |
| What do electrons occupy? | Particular energy levels |
| Do the electrons in an atom occupy the highest or lowest available energy level? | Lowest |
| What is the mass of a proton? | 1 |
| What is the mass of a neutron? | 1 |
| What is the mass of an electron? | Very small |
| What is the relative atomic mass of an element? | It compares the mass of atoms of the element with the 12C isotope It is an average value for the isotopes of the element |
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