Nucleus

Positively charged nucleus of an atomSmallest particle of an element which cannot be chemically d.... Its diameter amounts to some 10-13 (ten trillionths) of a cm, i.e. around 1/100,000 of the atom’s diameter. It contains almost the total mass of the atomSmallest particle of an element which cannot be chemically d.... The nucleus of an atomSmallest particle of an element which cannot be chemically d..., apart from the nucleus of normal hydrogen, is made up of protons and neutrons. The number of protons determines the nucleus charge or atomic numberNumber of protons in an atomic nucleus. Each chemical elemen... Z, the number of protons plus neutrons – the nucleons – the nucleonGroup name for protons and neutrons. or mass numberMass of an atom in nuclear mass units. Number of protons and... M of the nucleus.