Roman numerals are used: I, II, III.
Because transition metals can assume more than one charge, the transition metal ion is named by using a Roman numeral
Transition metals form more than one ionic charge; Roman numerals (in parentheses) follow the ion's name. Cu2+ is copper (II) ion.
When naming a transition metal ion that can have more than one common ionic charge, the numerical value of charge is indicated by either (i) the charge number in capital Roman numerals within parentheses after the cation name or (ii) a distinct form of the cation name, ending in "ic" for the higher ionic charge or "ous" for the lower ionic charge. Method (i) is usually preferred now, but method (ii) was often used fifty years ago and is sometimes still used.
Manganese (Mn) is a transition element having various charges, and an atomic number of 25. It's valences are : +2, +3, +4 and +6. The most common ion charge of Mn is +2.
The most common charge is +6.
Roman numerals are used: I, II, III.
Because transition metals can assume more than one charge, the transition metal ion is named by using a Roman numeral
Transition metals form more than one ionic charge; Roman numerals (in parentheses) follow the ion's name. Cu2+ is copper (II) ion.
When naming a transition metal ion that can have more than one common ionic charge, the numerical value of charge is indicated by either (i) the charge number in capital Roman numerals within parentheses after the cation name or (ii) a distinct form of the cation name, ending in "ic" for the higher ionic charge or "ous" for the lower ionic charge. Method (i) is usually preferred now, but method (ii) was often used fifty years ago and is sometimes still used.
Manganese (Mn) is a transition element having various charges, and an atomic number of 25. It's valences are : +2, +3, +4 and +6. The most common ion charge of Mn is +2.
numerical addition
That depends on the numerical value of A.
oxygen H2O
That depends on their numerical value.
yi
To start with, common sense.
That depends on their numerical values.