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| Term | Definition |
|---|---|
| metals | they are located to the left of the stair-step line. they tend to lose electrons in chemical reactions to form positive ions. they are good conductors of heat and electricity, shiny malleable, and ductile. |
| metalloid | they border the stair-step line and they have some properties of both metals and nonmetals. |
| nonmetals | they are located to the right of the stair-step line. they tend to gain electrons in chemical reactions to form negative ions . they are poor conductors of heat and electricity( good insulators), brittle and dull as soilds. |
| periodic law | the law that states the repeating chemical and physical properties of elements change with the atomic numbers of the elements . |
| atomic symbol | identifies the element, consists of one, two, or three letters. the first letter is always capitalized. all other letters are lower case. |
| proton | a positive subatomic particle that is located in the nucleus having a mass of 1 amu. it was discovered by Rutherford |
| neutron | a subatomic particle with no charge that is located in the nucleus having a mass of 1 amu. it was discovered by chadwick |
| electron | a negative subatomic particle that is located in the electron cloud having mass of 0 hmu. it was discovered by thomson |
Created by:
kyliesnead
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