SCIENCE 8 COT, ATOMIC STRUCTURE 3RD QUARTER

science 8 3rd quarter, atomic structure

1. SCIENCE 8 ATOMIC STRUCTURE EDEM IRISH S. RIVERA T-I

2. What was our topic last meeting? Matter undergo physical and chemical changes. Physical change occurs when a substance changes its appearance without changing its composition . Chemical change on the other hand, occurs when a substance is transformed into another substance.

3. At the end of a 60-minute period, at least 80% the learners should be able to : Identify protons, neutrons and electrons in a particular atoms; Determine the differences of protons, neutrons and electrons in a particular atoms; Appreciate protons, neutrons and electrons in a particular atom in different activities in real life situation.

4. Do you know that all the elements in the periodic table can be found in nature and some are discovered in the laboratory. For example: water composed of 2 hydrogen and 1 oxygen, salt composed of 1 sodium and 1 chlorine.

5. Complete Me Directions: Complete the table with the needed information. Please refer to your periodic table . Element Atomic Number Atomic Mass Number of Neutrons 1. Sodium (Na)       2. Calcium ( Ca )       3. Chromium (Cr)       4. Silicon (Si)       5. Sulfur (S)      

6. Guide Questions : How did you identify the atomic number and atomic mass? How would you know the number of neutrons if you know the mass number and the atomic number?

7. The Protons, Electrons and Neutrons Matter is made up of atoms which are too small to see with the unaided eye. The ancient Greek Philosophers thought that atoms has no parts. However, during the latter part of 19 th century and early half of the 20 th century the scientist discovered that atoms composed of three types namely: protons, neutrons and electrons.

8. The Protons, Electrons and Neutrons Protons carries a positively charged. Electrons carries a negatively charged. Neutrons which does not carry any charge.

9. The Protons, Electrons and Neutrons An atom is identified by two numbers atomic number and mass number Z x A A – Mass Number, Z – Atomic number ; x – an element

10. The Protons, Electrons and Neutrons Atomic number = Z = number of protons = number of electrons Mass Number =A = Number of protons + number of neutrons = atomic number + Number of neutrons   Number of neutrons = Mass number - atomic number

11. Example How many protons (p+), electrons (e-), and neutrons (n ) in (Sodium) 11 Na 23 atom. Given: Element: Sodium (Na) Atomic Number of Na = 11 Mass Number of Na = 23 Answer: p+ = 11; e- = 11; n = 12

12. Why is it important to know protons, neutrons and electrons of each element? You learned that matter is made up of atoms which are too small to see with the unaided eye. The ancient Greek Philosophers thought that atoms has no parts. However, during the latter part of 19 th century and early half of the 20 th century the scientist discovered that atoms composed of three types namely: protons, neutrons and electrons. If you are interested of being a scientist one day, maybe you can discover more about atoms and uncover new things about it.

13. Atoms are composed of three types and what are they ? Protons, neutrons and electrons

14. How did you identify the atomic mass and atomic number ? Atomic number is located at the lower left and the mass number is at the upper right.

15. How did you identify the protons, neutrons and electrons ? Protons and electrons is the atomic number while the neutrons is the difference of atomic mass and atomic number.

16. Try Again! Directions : Indicate the number of protons (P+), number of electrons (e- ), number of neutrons (n ) of the following atoms . 1. 13 Al 27         Number of Protons (P + )       Number of Electrons(e - )       Number of Neutrons (n )   2. 26 Fe 56         Number of Protons (P + )       Number of Electrons(e - )       Number of Neutrons (n )   3. 53 I 127         Number of Protons (P + )       Number of Electrons(e - )       Number of Neutrons (n )   4. 92 U 235         Number of Protons (P + )       Number of Electrons(e - )       Number of Neutrons (n )   5. 14 Si 29         Number of Protons (P + )       Number of Electrons(e - )       Number of Neutrons (n )  

17. Guide Questions Q1. If you know the number of protons of an atom, what other particle would you automatically know the number ? And, why ? Q2. How will you compute for the number of neutrons?

18. The PEN From the given examples above, determine the following: 1. What is the number of protons and number of electrons in Krypton atom? 36 Kr 84 2. What is the atomic mass of an element with 40 protons, 40 electrons, and 46 neutrons? 3. Determine the atomic number, mass number, when the number of protons is 8, number of electrons is 8 and number of neutrons is 8.  

19. The PEN From the given examples above, determine the following: 4. How will you compute for the number of electrons in a potassium with 24 protons and atomic number of 24?    5. Solve for the atomic mass of an element with atomic number is 30 and number of neutrons is 35, and number of electrons is 30.

20. Assignment (Individual activity) THIS IS IT ! Direction : Write at least 5 examples of situations in work related activities that you had experienced which you think the protons (the positive charged particle), electrons (the negative charged particle), and neutrons (the neutral charged of atom) was applied.

21. THANK YOU!!!