22931466
Description
Flashcards by kalshini dulmitha, updated more than 1 year ago
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Created by kalshini dulmitha
almost 5 years ago
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| Question | Answer |
| What is the building unit of matter ? | Atom |
| Name the subatomic particles. | 1. Protons ( charge +) 2. Neutrons ( charge -) 3. Electrons ( charge 0) So the atom is electrically neutral. |
| The atomic model was introduced... | - with the identification of subatomic particles - as a result of efforts taken to describe how they were arranged in matter |
| Who found the nuclear model ? When? | Ernest Rutherford in 1911 |
| What special feature did it bring out ? | According to that a small area called the nucleus was at the center of the atom. [NUCLEAR...] |
| What are the subatomic particles in the nucleus ? | Protons & Neutrons |
| What about the size of the atom ? | Relatively small to the atom. If the atom was a football pitch, nucleus 'd be smaller than a chickpea. |
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