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The periodic table by Mind Map: The periodic table
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The periodic table

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The value of the table gradually became clear, but not its meaning. Scientists soon recognized that the table's arrangement of elements in order of atomic weight was problematic. The atomic weight of the gas argon, which does not react readily with other elements, would place it in the same group as the chemically very active solids lithium and sodium. In 1913 British physicist Henry Moseley confirmed earlier suggestions that an element's chemical properties are only roughly related to its atomic weight (now known to be roughly equal to the number of protons plus neutrons in the nucleus). What really matters is the element's atomic number--the number of electrons its atom carries, which Moseley could measure with X-rays. Ever since, elements have been arranged on the periodic table according to their atomic numbers. The structure of the table reflects the particular arrangement of the electrons in each type of atom. Only with the development of quantum mechanics in the 1920s did scientists work out how the electrons arrange themselves to give the element its properties.

Groups

1.the alkali metals or lithium family

2.the alkaline earth metals or beryllium family

3.the scandium family

4.the titanium family

5.the vanadium family

6.the chromium family

7.the manganese family

8.the iron family

9.the cobalt family

10.the nickel family

11.the copper family

12.the zinc family

13.the boron family

14.the carbon family

15.the pnictogens or nitrogen family

16.the chalcogens or oxygen family

17.the halogens or fluorine family

18.the helium family/neon family

Periodic

the first period

the second period

the third period

the fourth period

the fifth period

the sixth period