W1-Atomic Number and Synthesis of Elements (PDF)

Review What did we discuss last meeting? Structure of the Atom by Maruja Jessa B. Bancale, BS Biology Objectives: At the end of the discussion, the students will be able to: Explain how the concept of atomic number led to the synthesis of new elements in the laboratory (S...

Review What did we discuss last meeting? Structure of the Atom by Maruja Jessa B. Bancale, BS Biology Objectives: At the end of the discussion, the students will be able to: Explain how the concept of atomic number led to the synthesis of new elements in the laboratory (S11/12PS-IIIb-11); and, Write the nuclear reactions involved in the synthesis of new elements (S11/12PS-IIIb-12). What phone numbers are you familiar with? Why are phone numbers important? What are the significant numbers found in each element in the periodic table? *insert structure of the atom Nuclear model of an atom The Structure of the Atom  Structure of the Atom Atomic number= # of protons= # of electrons Atomic mass= TOTAL # of protons and neutrons *Atomic mass= mass number= atomic weight Denoting Atomic number and Mass number Mass Numb er Atomi c Numb er  Try this! Mass Number or Atomic Number? Mass Atomi Atomi Numb c c er Mass Weigh Atomi t c Numb er How can we get the number of subatomic particles (protons, neutrons, and electrons)? How can we get the number of subatomic particles (protons, neutrons, and electrons)? The Structure of the Atom Isotopes- atoms with the same atomic number (Z) but different mass number (A) Nuclear Reactions Involved In The Synthesis of New elements Radioactivity- radioactive decay by unstable nuclei; emit particles and electromagnetic radiation  Nuclear Reactions Involved In The Synthesis of New elements Nuclear transmutation- nuclei are bombarded with neutrons, protons, or other nuclei (results hen neutrons from the sun bombard nitrogen isotopes) COSMIC PHASES Nuclear Reactions Involved In The Synthesis of New elements To balance a nuclear reaction: Total of all atomic numbers must be balanced Total of all mass numbers of the products and reactants must also be balanced Reactants Products Mass #: 18 Mass #: 18 Atomic #: 9 Atomic #: 9 Let’s check your understanding! Given the following items: (a) atomic number; (b) mass number; (c) both mass number and atomic number. Which of these would you use to obtain the following? a. No. of protons in an atom b. No. of neutrons in an atom c. No. of particles inside the nucleus of an atom d. No. of electrons  Practice Exercises Complete the Table. Name of Symb Atomi Mass No. of No. of No. Of element ol c numbe proton neutro electro numb r s ns ns er 1.Alumin um Al 13 27 13 14 13 2. Potassiu 20 m 3. N 15 4. Calcium 42 5. Barium 56 6. Complete the nuclear reaction and identify the cosmic phase. _______ _______