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Term | Definition |
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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 have some properties of both metal and nonmetal |
Nonmetal | 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 solids. |
Periodic Law | The law that states that the repeating chemical and physical properties of elements change with the atomic numbers of the elements |
Atomic Symbol | Identifies the elements,consists of one,two,or three letters.The first letter is always capitalized.All other letters are lower cas |
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 |
Electrons | A negative that is located in electron cloud having a mass of 0 amu. It was discovered by Thomson |