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Chapter11/12TermsTZ
Chapter11/12TermsZT
Question | Answer |
---|---|
Atoms | make up all things around us |
Parts of an atom | include the electrons, protons, neutrons |
Protons | + |
Neutrons | no charge |
Electrons | - |
Charges are attracted to ___ | Opposites |
There are over ___ different atoms | 100 |
__ elements are found in nature | 91 |
Molecule | is a group of two or more atoms held together by very strong chemical bonds |
Compounds | are pure substances made up of two or more different elements that are chemically joined. |
Mixtures | are combined physically |
Heterogeneous mixtures | are mixtures of substances that are not distributed evenly throughout |
Homogeneous mixtures | are mixtures of substances that are evenly distributed throughout |
Solution | is a special kind of homogeneous mixture in which one substance is completely dissolved in another substance. |
Periodic table of the elements | presents and organizes information about all the elements |
Atomic number | identifies the number of protons in the nucleus of one atom of an element. |
Atomic mass | is the number of protons and neutrons added together |
Period | is each horizontal row in the Table of Elements |
Group or family | is a vertical column in the Table of Elements |
Alkali Metals/Group 1 | This group contains metals that are very reactive. They share the properties of being soft, silver-colored, shiny, and have a low density. They have 1 electron in the outer level. |
Alkaline-Earth metals/Group 2 | Metals that are reactive, but less reactive than alkali metals. They are silver-colored and more dense than alkali metals. They have 2 electrons in the outer level. |
Transition Metals/Group 3-12 | Metals that ave 1 or 2 electrons in the outer level . They are less reactive than alkaline metals. They are shiny, good conductors, have higher densities and melting points (except for mercury) than elements in groups 1 and 2 |
Boron Group/Group 13 | One metalloid and four metals (Boron, alumininum, gallium,indium, thallium). At room temperature it is solid. It is very reactive. It has 3 electrons in the outer level. |
Carbon Group/Group 14 | One nonmetal, two metalloids, and two metals (Carbon, silicon, germanium, tin, lead). It is solid at room temperature. Its reactivity varies among the elements.There are 4 electrons in the outer level. |
Nitrogen Group/Group 15 | Two nonmetals, two metalloids, one metal (Nitrogen, phosphorus, arsenic, antimony, bismuth) |