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Chem Set 1

Atomic Structure and PT

Alkali metals Group 1 on the PT, MOST reactive METALS on PT
Alkaline earth metals Group 2 on the PT, VERY reactive metals but not as much as Group 1
Atom the smallest type of matter
Atomic Mass the mass of an atom, approximately the number of protons plus the number neutrons
Atomic Number the number of protons in each element; identifies the atom on PT
Group/Family a.k.a. columns, vertical on the PT...18 of them
Halogens Group 17, MOST very reactive of all nonmetals
Inert unable to react chemically
Electron the negative charge of an atom, OUTSIDE the nucleus
Metalloids Sometimes act like metals and sometimes like nonmetals, Found on both sides of the STEPLADDER of the PT
Metals Elements that are hard, ductile, malleable, and good conductors of heat and electricity
Neutron the neutral charge of an atom, INSIDE the nucleus
Nonmetals elements that do not have the physical and chemical properties of metals, mostly gases, dull & brittle solids, & are not conductive
Nucleus the center of an atom
Proton the positive charge of an atom, INSIDE the nucleus
Transition metals groups 3
Valence electron The outermost electrons in an atom, Used in chemical bonding
Synthetic element man-made element using a particle accelerator
Semiconductor a material that conducts electricity under some conditions but not others
Period a.k.a. rows, horizontal on the PT….7 of them
Created by: jhandy8
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