radius
There is no R in the periodic table. There is Rb, Rf, Re, and Rn.
This would be called an element, or a mono-atomic compound.
There are three elements. They are carbon,hydrogen and oxygen.
Group 1 Elements (elements in the first group [column]) are classed as Alkali Metals. Group 2 Elements (elements in the second group [column]) are classed as Alkaline Earth Metals. All elements not in a representative group are classed as Transition Metals. Group 3 Elements (elements in the third full group [coulumn]) are classed as Earth Metals
Hydrogen and oxygen are already elements. Elements do not contain other elements.
There is no element with the atomic symbol of "R"
Elements can belong to subsets. Subsets can be elements of sets that are called "power sets".
H. R. Byers has written: 'Elements of cloud physics'
R. J. Puddephatt has written: 'The periodic table of the elements'
A R. Powell has written: 'The analysis of minerals and ores of the rarer elements'
potassium, carbon and oxygen
R. Mulvihill has written: 'The relative importance of elements of low-rise housing estates'
R. W. Cushman has written: 'Elements of success' -- subject(s): Success
There is no R in the periodic table. There is Rb, Rf, Re, and Rn.
Ian R. Brown has written: 'The elements of pre-project control of a North Sea project'
N. R. Dhanraj has written: 'Elements of maintaining quality in the operation of a flexible manufacturing system'
Don R. Marshall has written: 'The Four Elements of Successful Management' -- subject(s): Management