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# Hakim nucleus of an atom

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### Hakim nucleus of an atom

1. 1. NUCLEUS OF AN ATOM • Composition of the nucleus of an atom in terms of protons and neutrons • Proton number (Z) and nucleon number (A) • Nuclide notation • Isotopes
2. 2. Composition of the nucleus of an atom in terms of protons and neutrons Electrons orbit the nucleus Nucleus Contains neutrons and protons
3. 3. Proton number (Z) and nucleon number (A) Proton number is known as the number of protons and labelled as Z  Nucleon number is the total number of protons and neutrons. It is symbolised as A  Number of neutrons is A-Z.  Example,  A 12 C 6 Z
4. 4. Example 1 1. Atom K has 4 protons and 3 neutrons. Calculate the nucleon number of atom K. Proton number=4 Number of neutrons=3 ∴ nucleon number = proton number + number of neutrons =4+3=7
5. 5. Example 2 2. 18 p L Given number of neutrons is 7. Find p. Nucleon number=18 Number of neutrons=7 ∴ proton number = nucleon number – number of neutrons = 18 -7 = 11
6. 6. Example 3 3. Atom Z consists of 36 nucleons and 17 protons. Calculate the neutrons of atom Z. Nucleon number = 36 Protons number = 17 ∴ number of neutron = nucleon number – protons number = 36-17 = 19
7. 7. Nuclide notation NUCLEON NUMBER PROTON NUMBER A Z X SYMBOL OF ELEMENT A nuclide is a type of nucleus with a particular proton number and a particular nucleon number like isotopes for instance.
8. 8. Isotopes   Atoms that have the same protons number but diffferent nucleon number. Isotopes of the same element has the same chemical properties but different physical characteristics
9. 9. Examples of isotopes  Carbon 13C 6 14C 6 12C 6 Carbon-13 Carbon-14 Carbon-12  Uranium 232U 92 Uranium-232 234U 92 235U 92 Uranium-234 Uranium-235