Metals, Nonmetals and Metalloids

Elements can be broadly classified as metals, nonmetals and metalloids.
 
Metallic elements
• are solid (except for mercury)
• are shiny
• can be hammered into sheets.
• can be drawn out as wires.
• characteristically conduct electricity.

aluminium
Nonmetallic elements
• may be solids, liquids or gases (if solid, they are brittle)
• characteristically do not conduct electricity.

sulfur
Metalloids
• look like metals
• behave chemically like nonmetals.

silicon

As shown below, three-quarters of the elements are metals.
Metallic character decreases going to the right across a period and increases going down a group.

Thus the position of an element in the periodic table indicates whether it has metallic or non-metallic characteristics. 
1 2
  1H 2He
3 Li 4 Be   5 B 6 C 7 N 8 O 9 F 10 Ne
11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar
19 K 20 Ca 21 Sc 22 Ti 23 V 24 Cr 25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn 31 Ga 32 Ge 33 As 34 Se 35 Br 36 Kr
37 Rb 38 Sr 39 Y 40 Zr 41 Nb 42 Mo 43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd 49 In 50 Sn 51 Sb 52 Te 53 I 54 Xe
55 Cs 56 Ba 71 Lu 72 Hf 73 Ta 74 W 75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg 81 Tl 82 Pb 83 Bi 84 Po 85 At

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