BECE Science 2010 Paper

The superscript represents the mass number which is made up of neutrons and protonsThe value of the superscript is 12 .Number of protons + Number of neutrons $=12$The subscript represents the atomic number which is the number of electrons in a neutral atom. In a neutral atom, the number of electrons is equal to the number of protons.Atomic number $=6$Atomic number $=$ Number of electronsNumber of electrons $=$ Number of protonsNumber of electrons $=6$Number of protons $=6$Protons + Neutrons $=12$$6+$ Neutrons $=12$Neutrons $=12-6$Neutrons $=6$