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ch.17 1,2,3
| Question | Answer |
|---|---|
| atom | An atom is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of protons and neutrons with electrons orbiting this nucleus. |
| nucleus | The central and most important part of an object, movement, or group, forming the basis for its activity and growth. The positively charged central core of an atom, containing most of its mass. |
| proton | A proton is a positively charged particle that resides in the nucleus of an atom. |
| neutron | A neutron is a subatomic particle contained in the atomic nucleus. It has no net electric charge, unlike the proton's positive electric charge. The number of neutrons in an atomic nucleus determines the isotope of that element. |
| electron | An electron is a fundamental particle, which means it cannot be broken into smaller particles. Electrons may be bound in the "electron cloud" surrounding an atomic nucleus, or may break free from the cloud as a "free electron." |
| quark | A quark is one of the fundamental particles in physics. They join together to form hadrons, such as protons and neutrons. The study of quarks and the interactions between them is called quantum chromodynamics. |
| electron cloud | icture of an electron state in which the charge is thought of as being smeared out, with the resulting charge density distribution corresponding to the probability distribution function associated with the Schrodinger wave function. |
| atomic number | The number of protons in an atomic nucleus. |
| mass number | The sum of the number of neutrons and protons in an atomic nucleus. Also called nucleon number |
| isotope | One of two or more atoms having the same atomic number but different mass numbers. |
| average atomic mass | The mass of an atom, usually expressed in atomic mass units |
| periodic table | A tabular arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column. |
| group | The vertical columns in the periodic table are called group. |
| electron dot diagram | The total number of electrons represented in a Lewis structure is equal to the sum of the numbers of valence electrons on each individual atom. Non-valence electrons are not represented in Lewis structures. |
| period | Period (from Greek περίοδος) or periodic may refer to |
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