| Term | Definition |
|---|
| atom | small particle that makes up most types of matter |
| periodic table | list of all the elements |
| atomic mass | weighted average mass of an element |
| atomic number | tells you the number of protons in the nucleus of each atom of an element |
| compound | a pure substance whoese smallest unit is mad eup of atoms of more than one element; element in a compound are always combined in the same proportion. water is an excellent example |
| electron | negatively charged subatomic particle |
| element | matter made up of one kind of atom |
| isotopes | atoms of the same element that have different numbers of neutrons |
| law of conservation of matter | states that matter is neither created nor destroyed, only changed in form |
| mass number | sum of an atom's protons and neutrons |
| matter | anything that takes up mass and space |
| What are examples of matter? | hydrogen, the sun, any atom, people |
| What things that are not matter? | light, heat |
| metals | located on the left of the periodic table, most solids are at room temperature, except mercury |
| neutron | uncharged particle |
| metalloids | found between the metals and nonmetals |
| metalloids | do not conducts electricity as well as metals |
| metalloids | have characteristics of both metals and nonmetals |
| metals | ductile - can be drawn into wires without breaking |
| metals | good conductors of heat and electricity |
| metals | shiny luster, malleable - can be shaped |
| mixtures | formed when two or more substances come together but don't combine to form a new substance |
| nucleus | positively charged central part of an atom |
| proton | positively charged particle in the nucleus of an atom |
| substance | a sample of matter that has the same composition and properties throughout |
| isotopes | have the same numbe rof protons, but different numbers of neutrons |
| protons | particle in an atom with a positive charge |
| atomic number | is equal to the number of protons |
| Who discovered the nucleus and protons? | Rutherford |
| isotopes | contain different number of neutrons |
| What is an example of a compound? | water |
| Where are elements found? | on the left side of the periodic table |
| What is an exampke of homogenous mixture? | air |
| Who developed a model called the atomic theory of matter? | Dalton |
| Who discovered the neutron? | Chadwick |
| atoms | small particles that make up most of the matter on earth |
| Who discovered the electron? | JJ Thompson |
| Who discovered the law of Conservative Matter/ | Lavoisier |
| atomic mass or mass number | is equal to the number of protons plus the number of neutrons |
| homogenous mixture | a mixture that is the same throughout |
| What is an example of homogenous mixture? | air |
| What is an example of a heterogenous mixture? | chocolate chip ice cream, vegetable soup |
| heterogenous mixture | you can see its individual parts |
| What are the number of atoms in C6H1206? | 24 |
| nonmetal | found in the far right of the periodic table |
| nonmetal | dull in appearance |
| nonmetal | poor conductors of heat and electricity |
| nonmetal | many are gases at room temperature |
| nonmetal | brittle - cannot be shaped without breaking |
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