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Atoms and Elements
| Question | Answer |
|---|---|
| Who discovered small negatively charged particles called electrons? | J.J. Thomson |
| Opposite charges do what with each other? | Attract |
| Like charges do what with each other? | Repel |
| What is the center of an atom which contains most of the atom's mass? | Nucleus |
| What are the positively charged particles inside an atom's nucleus called? | Protons |
| The particle that is found in the nucleus of an atom and has no electrical charge is a what? | Neutron |
| In Ernest Rutherford's "gold foil experiment", he discovered that what is mostly empty space? | An atom |
| Each energy level can hold a certain number of electrons. The first energy level is closest to what and can hold how many electrons? | Nucleus and 2 |
| When the first energy level is full, electrons begin to fill the second level. The second energy level can hold how many electrons? | 8 |
| When the second energy level is filled, electrons go to the next higher level. The last occupied energy level might or might not be filled. | True |
| The electrons in the outermost level are called what? | Valence electron |
| These outermost electrons are in involved in what? | Chemical bonding |
| If the atoms of a substance have their outer energy levels filled, they are what? Which means, if the outer energy level is filled, the atom will not combine with another atom to form a new substance. | Unreactive |
| Atoms with partially filled outer energy levels likely or unlikely to bond with other atoms? | Likely |
| Electrons are located within an area around the nucleus called what? | Electron cloud |
| What two parts of the atom has the same mass? | Protons and Neutrons |
| What has a small mass? | Electron |
| The most mass of an atom is found in the what? | Nucleus |
| Pure substances that cannot be broken down into any simpler substance is a what? | Element |
| Each element has atoms consisting of a specific number of what? | Protons, neutrons, and electrons |
| The number of protons in an atom of an element is its what? | Atomic number |
| Atoms normally have the same or different numbers of electrons as protons? | The same |
| Atoms of the same element that have different numbers of neutrons are called what? | Isotopes |
| The sum of the number of protons and neutrons in the nucleus of an atom is the atoms what? | Mass number |
Created by:
bryantf
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