The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic ... table used in chemistry. For other uses, see Periodic table ( disambiguation). Modern periodic table,...
Our modern day periodic table is expanded beyond Mendeleev's initial 63 ... The
TA secondary school revision resource for Edexcel GCSE Science about the
Periodic law was first developed in 1869 when Dimitri Mendeleev and Lothar
Meyer each developed a
Elements are arranged by increasing atomic number instead of atomic mass.
Later, Henry Gywn-Jeffreys Moseley showed that the atomic number of an element is numerically equal to the number of electrons round the nucleus.
Chemists have always looked for ways of arranging the elements to reflect the
similarities between their properties. The
Jan 3, 2016