CLASSROOM REMINDERS Sit properly. If you want to answer, just raise your hands. Do not answer in chorus. Avoid chatting with your seatmates during class discussion. Avoid using cellphone during class discussion, unless it is needed.
LET’S REVIEW
What do you call to the horizontal rows in the periodic table? How about the vertical columns in the periodic table? How about the other term for Nitrogen group? Do you still remember ? How about the other term for Oxygen Group?
What did you observed in the picture?
Is this information useful ?
How this information can be useful?
ELECTRONIC CONFIGURATION
Electronic configuration the way the electrons of an atom are distributed in the various energy levels of electron shells
Electron shell also called energy levels. A region where electrons located.
Electron shell
Valence shell the highest energy level that an electron occupies in the outermost shell.
Valence electrons the electrons in the valence shell or in the outermost shell.
Step 1: Get the atomic number of the element. Step 2: Start to write their electron configuration by starting to 1s 2
Element symbol Atomic number Electron configuration Mg For example:
Element symbol Atomic number Electron configuration Mg 12 1s 2 2s 2 2p 6 3s 2 For example:
Element symbol Atomic number Electron configuration Na For example:
Element symbol Atomic number Electron configuration Na 11 1s 2 2s 2 2p 6 3s 1 For example:
Element symbol Atomic number Electron configuration S For example:
Element symbol Atomic number Electron configuration S 16 1s 2 2s 2 2p 6 3s 2 3p 4 For example:
Element symbol Atomic number Electron configuration Ne For example:
Element symbol Atomic number Electron configuration Ne 10 1s 2 2s 2 2p 6 For example:
Element symbol Atomic number Electron configuration Zn For example:
Element symbol Atomic number Electron configuration Zn 30 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 For example:
Element symbol Atomic number Electron configuration Co For example:
Element symbol Atomic number Electron configuration Co 27 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 7 For example:
Element symbol Atomic number Electron configuration V For example:
Element symbol Atomic number Electron configuration V 23 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 3 For example:
Element symbol Atomic number Electron configuration Mo For example:
Element symbol Atomic number Electron configuration Mo 42 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 4 For example:
Element symbol Atomic number Electron configuration Sc For example:
Element symbol Atomic number Electron configuration Sc 21 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 1 For example:
Element symbol Atomic number Electron configuration Ca For example:
Element symbol Atomic number Electron configuration Ca 20 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 For example:
Q & A SESSION
ACTIVITY TIME
Element symbol Atomic number Electron configuration Antimony ( Sb ) 51 Strontium ( Sr ) 38 Arsenic (As) 33 Tellurium ( Te ) 52 Gold (Au) 47 Bromine (Br) 35 Zirconium ( Zr ) 40 Barium (Ba) 56 Titanium (Ti) 22 Rhodium (Rh) 45
Element symbol Atomic number Electron configuration Chromium (Cr) 24 Technetium ( Tc ) 43 Molybdenum (Mo) 42 Cerium ( Ce ) 57 Ruthenium ( Ru ) 44
QUIZ TIME
I. Direction: Identify the term being referred to.
1. It is also called as the energy levels.
2. It is the highest energy level that an electron occupies in the outermost shell .
3. What do you call to the electron that occupies the outermost shell ?
4. It is the way the electrons of an atom are distributed in the various energy levels of electron shells .
5. A region where electrons located.
II. Direction: Complete the table by supplying the missing information .
Element symbol Atomic number Electron configuration K 19 Sr 38 S 16 O 8 Rb 37 Kr 36 Sc 21 V 23 Cs 55 Zr 40