Question

5. Where are the main group elements found on the periodic table (1 mark) 6. An FM radio station found at 103.1 in the FM dial broadcasts at a frequency of 1.031 x 10 s'(103.1 MHz). What is the wavelength of these radio waves in meters. (2 marks) 7. Using complete subshell notation 1s 2s2 etc, predict the electronic configuration of: (1 marks) a. Al The third energy level has a maximum of nine (9) orbitals, therefore how many electrons can be found in the third energy level? (1 mark) 9. Predict if the following compounds are ionic or covalent (2 marks) a. SO2 b. CaF2 c. NzH4 d. Al2(SO4)3 10. Predict the formula for the following: (2 marks) a. Cat and H2PO4 b. Bata and PO43

can you help please

Answer 1

☆ Main younds Slemen e Napresentando dementi che le element that sclay to séleck & p-block. tie. Gwad 1, Grorfha - 8-black (nough !3 - Group18 } -p-bloche. Irrguany Also, speed of light in air c oa Warelength of FM radio waves 3 xlokm/s = 1.031 xls txt 3 m . 1031 (2.91m - At Wavelength of FM radio wares 1 7. Al : 11²21²286 36 3p' . (Complete subshell Notation 2:13 Slectronic Compozuation of all 8. - Prinußal quantum Number For na 3 (3rd Energy loval) l = 0, 1, 2 (for in the value of l varies from oto n-1} | Azimuthal Quantum Number l=0(s-orbital) .lallp-orbital) l=2 /d-orbital) الا 1 orbital Zorbital, sorbitals

. so, Total There are 9 orbitals and each orbited can have mani'mem get 2 e. so Maximum no. of electrons = 2*4=18. - 9. cas so 1. (b) Cafe Covalent Ponie (as Band is formed between a metal & a non metal ) 1 Ca Covalent as (f) (C) (d) Na Hu Al(Sou} - - - Ionic (as Bond is formed between a metal (Als & Sulphate radical ) - loiras Ca²+ and M₂ Pou formula - Calt_powe I can helon Ai Caft, Pogle = Calh, poy, (6) Ba2+ and porn Ba pou X Ba,(PO4), (formula)