Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table’s arrangement also allows scientists to discern trends in ...

The underlying reason for these trends is electron configurations of atoms. The first periodic table to become generally accepted was that of the Russian chemist Dmitri Mendeleev in 1869: he ...

He was the first person to recognise the periodic trends in the properties of elements ... The periodic table was arranged by atomic mass, and this nearly always gives the same order as the atomic ...

The number of subatomic particles in an atom can be calculated from the atom's atomic number and mass ... the periodic table - AQA Elements in the same group of the periodic table show trends ...

The numbers of subatomic particles in an atom can be calculated from its atomic number and mass ... in the periodic table - AQA Elements in the same group of the periodic table show trends in ...