Chapter 5 RADIOACTIVITY5.1 UNDERSTANDING THE NUCLEUS OF AN ATOMA student is able todescribe the composition of the nucleus of an atom in terms of protons and neutrons.defne proton number (Z) and nucleon number (A.e!plain the term nuclideuse the nuclide notationdefne the term isotope5.1 UNDERSTANDING THE NUCLEUS OF AN ATOMXAZAtoms Around Us5.1 UNDERSTANDING THE NUCLEUS OF AN ATOM"atter is made up of #er$ small particles called atoms.%&' (ater is made up of t(ohydrogen (H)atoms and oneoxygen (O)atom.Atoms Around Us5.1 UNDERSTANDING THE NUCLEUS OF AN ATOMAn atom consists of a nucleus (hich is made up of proton and neutron (ith electron re#ol#in&around the nucleus.Nucleus of An Atom5.1 UNDERSTANDING THE NUCLEUS OF AN ATOMThe composition of the nucleus*eutron+ n Actual mass , -../!-012/ 3& Relati#e mass ,- Relati#e char&e , neutral Value of char&e , 04roton+ p Actual mass , -../!-012/ 3& Relati#e mass ,- Relati#e char&e , 5- Value of char&e , 5-..!-01-6C%lectron+ e Actual mass , 6.--!-017- 3& Relati#e mass ,-8-9:0 Relati#e char&e , 1- Value of char&e , 1-..!-01-6CNucleus of An Atom5.1 UNDERSTANDING THE NUCLEUS OF AN ATOMThe composition of the nucleus*ucleus-. Consists of protons and neutrons2. To&ether+ protons and neutrons are called nucleons7. *uclear densit$ , -0-. 3& m17Nucleus of An Atom5.1 UNDERSTANDING THE NUCLEUS OF AN ATOMAn!"#deis a t$pe of nucleus (ith a particular proton number and a particular nucleon number.%&' *eon+ a nuclide (hich has the element s$mbol *e+ proton number -0 and nucleon number 20.Ne2010Nucleus of An Atom5.1 UNDERSTANDING THE NUCLEUS OF AN ATOMThe proton number+ Z+ is defned as the number of protons in a nucleus.The nucleons number+ A+ is defned as the total number of protons and neutrons in a nucleus.Nucleus of An Atom5.1 UNDERSTANDING THE NUCLEUS OF AN ATOM;or neutral atom+ the number of protons e