science ch. 4 vocab.
7 Written Questions
6 Multiple Choice Questions
- a shaded region in the electron cloud where an electron is most likely to reside, based on its position in the atom.
- the number of protons in an atom, used to describe and element.
- British citizen born in New Zealand who proved the existence of the atomic nucleus.
- the weighted average mass (in AMU) of an element's atom in nature, roughly equal to the number of protons and neutrons that make up the most common versions of that element.
- a version of an element, that may have any number of neutrons, but only one number of protons.
- a rule that states that elements must combine to form compounds in integer ratio amounts
6 True/False Questions
Mole → exactly 6.02 x 1023 atoms or molecules of an element or compound. 1 unit of this is equal in mass to the atomic mass of an element or compound in grams.
Photon → a single "particle" of light.
Gold Foil Experiment → a special version of an element that emits radiation.
Cathode ray tube → instrument consisting of positively and negatively charged plates, used by Thomson to infer the existence of subatomic electrons.
Alpha particles → an ancient Greek philosopher who believed that the universe was composed of small, indivisible particles called atoms.
Dalton's Atomic Theory → idea that atoms are composed of negative and positive charges, arranged randomly, like plum pudding.