How many protons does Oxygen have? A)16 B)8 C)7 D)4 E)15

How many neutrons does Magnesium - 24 have? A)24 B)12 C)13 D)7 E)6

What is the atomic symbol for sodium? A)S B)So C)Sd D)NA E)Na

How many neutrons does Potassium – 40 have? A)19 B)40 C)39 D)21 E)20

The Modern Periodic Table

1.Periodic Law 2.Periods and Group 3.Classes of Elements

Periodic Law Elements are arrange by increasing atomic number Atomic # stands for _________________ Arrangement of Periodic Table Periods (horizontal rows) Groups/Families (Vertical Columns)

Periods Draw a Bohr Model of 1. Li 2. Na Li is in period 2 Na is in period 3 Periods differ by the number of available energy levels

Families Each group/family have similar properties because they have __________________________________ Valence electron = electrons in the outer most energy level

Classes of Elements Metals Conduct electricity and heat Solid at room temp Malleable Metals Transition Metals

Classes of Elements Non Metals Poor conductors of electricity and heat (insulates) Low boiling points Usually gas at room temps If solid, usually brittle Metals Transition Metals Non Metals

Classes of elements Metalloids Properties fall between Metals and Non Metals Some can conduct electricity and heat depending on temperature Non Metals Metals Transition Metals Metalloids

Si (Silicon) is a good insulators at low temps, good conductors at high temps WHY?????????? Non Metals Metals Transition Metals Metalloids

Calcium is considered what class of element? A)Metal B)Nonmetal C)Metalloid D)Class E)Period F)Valence electron

Boron is considered what class of element? A)Nonmetal B)Metal C)Metalloid D)Family E)Period F)Valence electron

This characteristic is used to organize elements in to families. A)Period B)Family C)Valance electrons D)Metal E)Metalloid F)Nonmetal