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BL Ch 4
Beaver Local 4
| Question | Answer |
|---|---|
| Who's atomic theory stated that atoms of a given element are exactly alike, and atoms of different elements could join to form compounds? | Dalton |
| A chemical compound always contains the same elements in exactly the same proportion the same proportion by weight or mass. | Law of definite proportions |
| What law states that any sample of water contains the same proportion of hydrogen and oxygen by mass | Law of definite proportions |
| Who revealed that atoms could be divided? | Thomson |
| Which two theorists stated that atoms could not be divided? | Democritus and Dalton |
| Who discovered electrons? | Thomson |
| Negatively charged particles inside an atom | Electrons |
| Thomson's model that said that electrons are spread throughout the atom is known as just like blueberries are spread throughout the muffin | Plum-Pudding model |
| Who proposed that most of the mass of an atom is concentrated at the atom's center | Rutherford |
| Who discovered the nucleus? | Rutherford |
| The positively charged, dense core of the atom | Nucleus |
| What two particles does the nucleus contain? | Protons and Neutrons |
| The particle inside the nucleus that has a Positive charge | Proton |
| The particle inside the nucleus that has No charge | Neutron |
| The particles moving around the outside of the nucleus | Electrons |
| What type of charge do electrons have? | Negative charge |
| An element is "defined" by the number of ________________ in an atom of that element | Protons |
| Most atoms do NOT have an overall charge because they have the same number of ____________ and _______________. | Protons and Electrons |
| What is an atom called if it gains or loses electrons and becomes charged? | Ion |
| What is the force called where positive and negative charges attract each other? | Electric Force |
| Tells you how many PROTONS are in an atom of the element | ATOMIC NUMBER |
| If the ATOMIC NUMBER for hydrogen is 1; how many or PROTONS does it have? | 1 |
| If uranium has 92 PROTONS, what is it's ATOMIC NUMBER? | 92 |
| The number of protons + the number of neutrons in an atom of an element = | Mass Number |
| If Fluorine has 9 protons and 10 neutron, what is it's mass number? | 19 |
| An atom that has the same number of protons but a different number of neutrons | Isotope |
| Mass Number - Atomic Number = | Number of Neutrons |
| A unit of mass that describes the mass of an atom or molecule | unified atomic mass unit |
| The SI base unit used to measure a collection of a very large number of particles | Mole (mol) |
| Electrons are found where? | In Energy Levels |
| The shaded region where electrons are likely to be present is an __________________. | Orbital |
| What determines the number of energy levels? | The number of Electrrons |
| Electrons in the outer energy level of an atom | Valence Electrons |
| The 4 types of orbitals | s,p,d,f |
| A unit of light that assists an electron to move into an excited state | photon |
Created by:
kjones0722
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