<P> The mass number is written either after the element name or as a superscript to the left of an element 's symbol . For example , the most common isotope of carbon is carbon - 12 , or 12 , which has 6 protons and 6 neutrons . The full isotope symbol would also have the atomic number ( Z ) as a subscript to the left of the element symbol directly below the mass number : 12 6C . This is technically redundant , as each element is defined by its atomic number , so it is often omitted . </P>
<P> The mass number is written either after the element name or as a superscript to the left of an element 's symbol . For example , the most common isotope of carbon is carbon - 12 , or 12 , which has 6 protons and 6 neutrons . The full isotope symbol would also have the atomic number ( Z ) as a subscript to the left of the element symbol directly below the mass number : 12 6C . This is technically redundant , as each element is defined by its atomic number , so it is often omitted . </P>
where do you write the mass number in the name of an atom
where do you write the mass number in the name of an atom
either after the element name or as a superscript to the left of an element 's symbol
either after the element name or as a superscript to the left of an element 's symbol