第1个回答 2011-01-19
1 periodic table of elements and compounds the deferred degeneration rule
1.1 atom radius
(1) except the 1 cycle outside, other cycles elements (inert gas elements with the exception of atomic radius of atomic number increasing and decreases,
(2) in the same group elements from top to bottom, with the electronic number increase, atomic radius increased.
The remnant 1.2 elements
(1) except the 1 cycle outside, with periodic from left to right, the highest by alkali metal elements at original + 1 to + 7, increasing nonmetal negative price of carbon race - 4-1 (fluorine increasing, oxygen is no general + 6 price, except),
(2) the same main group elements of the highest price are the same general, negative
130 elemental melting point
(1) the same cycle elements with atomic number increasing, elements of the metal elemental melting point of increasing, non-metallic elemental melting point of diminishing,
(2) in the same group elements from top to bottom, elements of the metal elemental melting-point descending, nonmetal elemental melting point increase
1.4 elements of gold attribute and nonmetal sex
(1) the same cycle elements from left to right gold attribute descending, nonmetal sex increasing,
(2) the same main group element from top to bottom gold attribute increments, nonmetal sex is degressive.
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