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8th Grade NC Chemistry Unit

Which scientist discovered a pattern to the elements in 1869? Dmitri Mendeleev
What does the word 'periodic' mean? happens at regular intervals
These elements are shiny, ductile,malleable, and good conductors Metals
These elements are also called 'semiconductors.' Metalloids
Horizontal row of elements Period
Verticle column of elements Group
This group of elements has 1 electron in their outer shell. They are very reactive. Alkali metals, Group 1
This group of elements are very reactive nonmetals. They have 7 electrons on their outer shell. They are salt producers. Halogens
Name for the electrons on the outer energy level of an atom. Valence electrons
This type of bond forms from the transfer of electrons from one atom to another. Ionic bond
This type of bond forms from the sharing of electrons between two atoms. Covalent bond
These are formed when atoms loose or gain electrons Ions
Any substance with a defined composition is called what? Chemical
These chemicals can be found in nature and are created by natural processes. Natural chemicals
These chemicals are not found in nature and are not made by natural processes. Synthetic chemicals
Created by: Ziemba



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