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BJU Physical Sci. 16
BJU Physical Science - Ch 16
| Question | Answer |
|---|---|
| A nuclear reaction in which an alpha particle is emitted. | alpha decay |
| A high-mass nuclear decay particle made up of 2 protons and 2 neutrons; a helium nucleus. | alpha particle |
| The mass of an atom or an element expressed in atomic mass units. | atomic mass |
| A unit used to measure the mass of an atom; 1/12 of the mass of a carbon-12 atom. | atomic mass unit |
| The number of protons in the nucleus of an atom which determines the identity of the atom. | atomic number |
| A nuclear reaction in which a beta particle is emitted. | beta decay |
| A low-mass, negative decay particle consisting of a nuclear electron emitted in nuclear decay. | beta particle |
| An atomic model developed by John Dalton, who theorized that each element has its own kind of indivisible atom and that atomic mass differences are main due the way varying thickness of their "heat envelopes." | core-envelope model |
| A 3D region within an atom occupied by groups of electrons with similar energy. | energy level |
| Nuclear decay resulting in the emission of a high-energy proton. | gamma decay |
| Different forms of the same element that have different numbers of neutrons. | isotope |
| A chemical compound is always made up of the same elements in the same proportions. | law of definite proportions |
| The sum of the protons and neutrons in the nucleus of an atom; also known as atomic mass. | mass number |
| The splitting of a large nucleus into 2 smaller nuclei and several free neutrons. | nuclear fission |
| The study of reactions involving atomic nuclei. | nuclear chemistry |
| The violent fusing of two small nuclei together to form a larger one under extremely energetic conditions. | nuclear fusion |
| Bohr's model of an atom; it looks like a miniature 3-D solar system. | planetary model |
| An atomic model developed by Ernest Rutherford where most of the atom's mass is concentrated and that the empty space around the nucleus contains the electrons. | nuclear model |
| The rays and particles emitted by unstable nuclei. | nuclear radiation |
| A proton or neutron bound in the nucleus of an atom. | nucleon |
| An atomic model developed by J.J. Thomson that views an atom as a sphere of positive charge in which negative electrons are embedded and suggests that the atom is divisible into smaller parts. | plum-pudding model |
| The current atomic model developed during the 20th century in which the tiny, dense atomic nucleus is surrounded by a "cloud" of electrons occupying 3-dimensional orbitals according to their energies. | quantum model |
| An electron in the highest or outermost energy level of a neutral atom. | valence electron |
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marchscience
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