Term
| Who was the first person to propose the idea that matter was not infinitely divisible. |
|
Definition
|
|
Term
| Democritus believed matter was made up of tiny individual particles called, _, from which the English word atom is derived. |
|
Definition
|
|
Term
| Democritus believed that atoms could be created, destroyed, or further divided. true or false. |
|
Definition
| false. he believed that they couldn't be. |
|
|
Term
| Democritus received much criticism for his ideas from other scientists, one of them being _. Why were these criticisms received? |
|
Definition
| Aristotle; They would ask what holds the atoms together, and he could not answer the question. |
|
|
Term
| Aristotle rejected Democritus' theory entirely. true or false. |
|
Definition
|
|
Term
|
Definition
| he denied the existence of atoms. |
|
|
Term
| John Dalton came up with.. |
|
Definition
|
|
Term
| All matter is composed of extremely small particles called atoms, atoms cannot be created divided or destroyed, and that in a chemical reaction atoms are separated, combined, or rearranged are all parts of.. |
|
Definition
|
|
Term
| Was all of Dalton's theory accurate? |
|
Definition
|
|
Term
| Wad Dalton's atomic theory a huge step toward our current atomic model of matter? |
|
Definition
|
|
Term
| What was Dalton wrong about? |
|
Definition
| He was wrong about atoms being indivisible, (they are now divisible into several subatomic particles) and about all atoms of a given element having identical properties (atoms of an element mayy have slightly different masses) |
|
|
Term
| Do all atoms of a given element have identical properties? |
|
Definition
|
|
Term
|
Definition
|
|
Term
| _ is the smallest particle of an element that retains the properties of the element. |
|
Definition
|
|
Term
| What does the scanning tunneling microscope allow you to do? |
|
Definition
|
|
Term
| Why was the accidental discovery of the cathode ray so significant? |
|
Definition
| it led to the development of the television |
|
|
Term
| Negatively charged particles that are part of all forms of matter are now known as _ |
|
Definition
|
|
Term
| Who began a series of cathode ray tube experiments to determine the ratio of its charge to its mass? |
|
Definition
|
|
Term
| Thomson concluded that the mass of the charged particle was much less than that of a _ atom, the lightest known atom. |
|
Definition
|
|
Term
| Who was the person that identified the first electron/ discovered it? |
|
Definition
|
|
Term
| How did Thomson prove that Dalton was wrong? |
|
Definition
| He proved that atoms were divisible into smaller subatomic particles. |
|
|
Term
| Who determined the charge of an electron? |
|
Definition
|
|
Term
| A single electron carries a charge of _ |
|
Definition
|
|
Term
| J.J Thomson proposed a model of the atom that became known as the ... |
|
Definition
|
|
Term
| Did the plum pudding model of the atom last long? |
|
Definition
|
|
Term
| Who conducted the gold foil experiment? |
|
Definition
|
|
Term
| Rutherford concluded by his experiment that the _ was incorrect because it could not explain the results of the gold foil experiment. |
|
Definition
|
|
Term
| Rutherford calculated that an atom is.. |
|
Definition
| consisted mostly of empty space through which the electrons move |
|
|
Term
| Rutherford also concluded that there was a tiny, dense region, called the _, centrally located within the atom that contained all of an atom's positive charge and virtually all its masss. |
|
Definition
|
|
Term
| Rutherford concluded that the nucleus contained positively charged particles called |
|
Definition
|
|
Term
| A _ is a subatomic particle carrying a charge equal to but opposite that of an electron; that is, a _ has a positive charge of _ |
|
Definition
|
|
Term
| James Chadwick showed that the nucleus also contained another subatomic particle, a neutral particle called the _ |
|
Definition
|
|
Term
| Who discovered the neutron? |
|
Definition
|
|
Term
| A _ has a mass nearly equal to that of a proton, but it carries no electrical charge. |
|
Definition
|
|
Term
| Three subatomic particles that are the fundamental building blocks from which all atoms are made from are _, _, and _. |
|
Definition
| electron, proton, neutron |
|
|
Term
| Where is the electron located? |
|
Definition
| in the space surrounding the nucleus |
|
|
Term
| Where are the protons and neutrons located? |
|
Definition
|
|
Term
| Electron are held within the atom by their attraction to the _ _ _. |
|
Definition
| positively charged nucleus |
|
|
Term
| Who discovered that atoms of each element contain a unique positive charge in their nuclei. |
|
Definition
|
|
Term
| The number of protons in an atom is referred to as the element's .... |
|
Definition
|
|
Term
| True or false; The period table is organized left to right and top to bottom by decreasing atomic number. |
|
Definition
| false; it's organized by increasing atomic number. |
|
|
Term
true or false ;
Atomic # = # of protons = # of electrons |
|
Definition
|
|
Term
| Atoms with the same number of protons but different numbers of neutrons are called _ |
|
Definition
|
|
Term
| true or false. Isotopes do not differ in mass. |
|
Definition
|
|
Term
| The number added after the element's name to help make it easy to identify each isotope of an element is the _ |
|
Definition
|
|
Term
| True or false; Number of neutrons = mass number - atomic number. |
|
Definition
|
|
Term
|
Definition
|
|
Term
| What is the weighted averaged mass of the isotopes of an element..? |
|
Definition
|
|
Term
| What do you need to calculate the atomic mass of an element? |
|
Definition
| number of naturally occurring isotopes, their masses, and their percent abundances |
|
|
Term
| A nuclear reaction involves a change in an atom's _ |
|
Definition
|
|
Term
| _ is a process in which some substances spontaneously emit radiation. |
|
Definition
|
|
Term
| The rays and particles emitted by the radioactive material is called _ |
|
Definition
|
|
Term
| Unstable nuclei lose energy by emitting radiation in a spontaneous process ( a process that does not require energy) called .. ? |
|
Definition
|
|
Term
| Scientists named the radiation that was deflected toward the negatively charged plate .. ? |
|
Definition
|
|
Term
| Alpha radiation is made up of.. ? |
|
Definition
|
|
Term
| Each alpha particle contains _ protons and _ neutrons, and thus has a _ charge. |
|
Definition
|
|
Term
| Since opposite electrical charges, attract, it explains why the _ particles are attracted to the negatively charged plate. |
|
Definition
|
|
Term
| An alpha particle is equivalent to a helium-4 nucleus, which is represented by |
|
Definition
4He
2
and it's also represented by the fish thing that represents jesus! |
|
|
Term
| The radiation that was deflected toward the positively charged plate is called |
|
Definition
|
|
Term
| beta radiation consists of fast moving electrons called |
|
Definition
|
|
Term
| Beta particles are represented by |
|
Definition
|
|
Term
| What is the charge for Beta? |
|
Definition
|
|
Term
| Whats the charge for Gamma? |
|
Definition
|
|
Term
| What are high-energy radiation that posses no mass and are denoted by the symbol 0/0y |
|
Definition
|
|
Term
| Because they possess no electrical charge, _ are not deflected by electric or magnetic fields. |
|
Definition
|
|
