electrons
valence electrons
Those Roman numerals on the periodic table refer to the number of valence electrons in a given group.
The Roman numeral "ii" represents the number 2. In the Roman numeral system, the letters "i" represents 1, and when it is repeated, it indicates addition. So, "ii" is the equivalent of adding two "i"s together to represent the number 2.
The letter on the left indicates the month it was made (for instance A=January and B=February). The roman numeral or number on the right indicates the year it was made.
The smallest 5-digit number is 10000. To get the smallest 5-digit number, we put a 1 in the first column (since we can't start with a 0 or else we'd get a 4 digit number!), then put a 0 in every other column.
valence electrons
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.
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