They represent the valance electrons in each element.
Roman numerals do no represent the valence electrons but it is the group number given by mendeleef.
electrons A+
electrons
The group number is an identifier used to describe the column of the standard Periodic Table in which the element appears.
For example the column 17 - halogens.
Hafnium may be found in column 4 of a wide form periodic table. This indicates that it has four valence electrons.
This is the group 1.
The atomic number of seaborgium is 106, and it is found in column 6 of a wide form periodic table.
electrons
valence electrons
The group number is an identifier used to describe the column of the standard Periodic Table in which the element appears.
For example the column 17 - halogens.
Hafnium may be found in column 4 of a wide form periodic table. This indicates that it has four valence electrons.
This is the group 1.
The atomic number of seaborgium is 106, and it is found in column 6 of a wide form periodic table.
When moving down a column in the periodic table, except for the first period of column 18, the number of valence electrons remains unchanged.
the informatio
By which column and geoup number it is in on the periodic table i learnt it in science
Atomic number 53, column 17, and period 5.
the number of protons