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Matter
Physical Science
Term | Definition |
---|---|
atom | The basic particle from which all elements are made. |
atomic number | The number of protons in the nucleus of an atom. |
electron | A tiny, negatively charged particle that moves around the nucleus of an atom. |
element | A pure substance that cannot be broken down into other substances by chemical or physical means. |
gas | A state of matter with no definite shape or volume. |
group | Elements in the same vertical column of the periodic table; also called family. |
liquid | A state of matter that has no definite shape but has a definite volume. |
molecule | A molecule made of 2 or more atoms bonded together. |
period | A horizontal row of elements in the periodic table. |
Periodic Table | A chart of the elements showing the repeating pattern of their properties. |
proton | A small , positively charged particle in the nucleus of the atom. |
neutron | A small particle in the nucleus of the atom, with no electrical charge. |
solid | A state of matter that has a definite shape and a definite volume. |
thermal energy | The total energy of all the particles of an object. |
Law of conservation of matter | The principle that the total amount of matter is neither created nor destroyed during any physical or chemical change. |
chemical change | A change in which one or more substances combine or break apart to form new substances. |
chemical property | A characteristic of a pure substance that its ability to change into a different substance. |
flammability | The ability to catch fire. |
physical change | A change in a substance that does not change it's identity. |
physical property | A characteristic of a pure substance that can be observed without changing it. |
reaction | The ease and speed with which an element combines , or reacts, with other elements and compounds. |
solubility | The ability to dissolve in another substance. |