| A | B |
|---|
| Atoms of the same element with different numers of neutrons | isotopes |
| the particle outside the nucleus | Electrons |
| if an atom has 12 protons, how many electrons does it have | 12 electrons |
| the sum of protons and neutrons in an atom | atomic mass |
| all atoms of the same element have the same number of protons and... | electrons |
| scientist whose model was called the plum pudding or chocolate chipe cookie model | JJ Thompson |
| most of the size (diameter) of the atom is found in | nucleus |
| area around the center of an atom | electron cloud |
| atomic mass of an atom comes from the protons and | neutrons |
| mucleus of an atom | positive charge |
| an element with atomic number of 99 | has 99 protons |
| element with an atomic mass of 20 has 8 neutrons and | 12 protons |
| what makes an atom an isotope | different amount of neutrons and protons |
| two subatomic particles are found inside the nucleus | protons and neutrons |
| what subatomic particle has a positive charge | protons |
| what subatomic particle has a neutral charge | neutrons |
| what subatomic particle has a negative charge | electron |
| what two subatomic particles have a mass of 1 a.m.u. | protons and neutrons |
| What makes an atom neutral | same number of protons and neutrons |
| how do you find that atomic mass of an atom | add protons and neutrons |
| num ber of protons | equals the number of electrons |
| center of an atom is called | the nucleus |
| who provided evidence of the nucleus of an atom | Rutherford |
| Who was known as the father of the atom | democrotice |
| Oxygen 17 and Oxygen 18 would be known as | Isotope |
| Isotope (hint) | I So Different |
