Dmitri Mendeleev (in his Periodic Table, who arranged according to increasing Atomic Mass).
Niels Bohr in the modern periodic table, where the elements are arranged in increasing atomic number.
Because they all have the same physical properties :) xx
Henry Moseley showed that atomic number is more fundamental property. So he organised the elements in accordance with atomic number.
J.A.R Newlands
he put them in groups to show acids from alkali's and gasses from metals
These groups are groups 3 to 12 (transition metals) containing each four chemical elements.
Main group elements have elements from groups 1 and 2, except hydrogen and groups 13 to 18. Main group elements are elements in groups who's lightest elements are shown by helium, lithium, boron, beryllium, carbon, nitrogen, oxygen, and fluorine.
There are 18 groups in the periodic table of elements.
There are 18 main groups in the modern periodic table of elements.
The elements are grouped in to 7's. I took John Newlands 12 years to think of that solution. :)
Groups 3-12 have elements with the most diverse set of properties in the periodic table. They are transition elements.
5 groups of elements
There are 18 groups and 7 periods in the modern periodic table.
The elements in the 8 main columns of the Pperiodic Table are called Groups. Groups 1 and 2 are separated from Groups 3 to 8 by a block of elements called the Transition Series and the columns in this series have no specific names.
he put them in groups to show acids from alkali's and gasses from metals
Group 8
The arrangement of chemical elements in groups and periods is determined by the periodicity of the chemical properties. In the case of the transition state elements, there are some smaller groups because of the way the incomplete inner electron shells are filled.
Elements located in groups 4 - 12 in the modern periodic table are considered as transition elements. Transition elements should not be confused with the d-block elements which are from groups 3 - 12.
because they have similar properties to the other elements in their groups
s block elements: groups 1-2 d block elements: groups 3-12 p block elements: groups 13-18
These groups are groups 3 to 12 (transition metals) containing each four chemical elements.