The document discusses the structure and properties of elements in the periodic table. It describes metals as having properties like luster, conductivity, and forming positive ions. Nonmetals are described as having opposite properties like brittleness, low conductivity, and forming negative ions. Metalloids are said to have properties that are between metals and nonmetals, such as varying luster and conductivity.

1. Structure of the Periodic
Table
Andrea Marie R. Paguio
BEED 1-3 Day

3. METALS - most elements are metals. 88 elements to
the left of the stair step line are metals or metal like
elements.
Physical Properties Of Metals
 Luster
 Good conductors of heat and electricity
 High density
 High melting point
 Ductile
 Malleable
Chemical Properties Of Metals
 Easily lose electrons to form positive ions
 Generally have less than four electrons in the outermost energy level.
 Form basic hydroxides

4. NONMETALS – have properties opposite those of the
metals.
Physical Properties Of Nonmetals
 No luster
 Poor conductor of heat and electricity
 Brittle
 Not ductile
 Not malleable
 Low density
 Low melting point
Chemical Properties Of Nonmetals
 Gain electrons easily to form negative ions
 Generally have more than four electrons in the outermost energy level
 Form acidic hydrides from acidic hydroxides

5. METALLOIDS – have properties that are somewhat
of a cross between metals and nonmetals.
Physical Properties Of Metalloids
 Solids
 Can be shinny or dull
 Ductile
 Malleable
 Conduct heat and electricity better than nonmetals but not as well as
metals.