12. Complete the table: (11) Element Symbol Atomic Mass Protons Neutrons Electro

Question

12. Complete the table: (11) Element Symbol Atomic Mass Protons Neutrons Electrons Period Family Mass Number 92 8 8 TI 13 13. Which has lower ionization energy: Beryllium or Calcium and why? (4) Electron Shell Diagram* 14. Referencing the diagram, complete the electron shell guidelines (A,B,C): (2) a. 2,8,18 b. 2,6,8 C. 2,8, 16 d. 2,4,16 Energy Leve a electrons Booond Enmry Level Enaray Fourth Enegy 15. Balance the following equations: (16) Pb(OH)2 +--HCl H2O + PbCl2 CO2+ Na3PO4 + _ CaCl2 -NaCl + _ Ca3(PO4)2

Explanation / Answer

15. Pb(OH)2+ 2HCl-------> 2H2O +PbCl2

2AlBr3 + 3K2SO4---> 6KBr+ Al2(SO4)3

CH4 + 2O2----> CO2 + 2H2O

2Na3PO4 +3CaCl2---> 6NaCl + Ca3(PO4)2

16. D. Geiger -muller or counter is portable instrument used to detect the radiation.

17.d. compound is mand up of elements.

18.B .noble gases

19. D, isotopes are hydrogen, deuterium, tritium.

21. B. cations are formed when atoms lose one or more electrons.

23. D. deionisation.

25. CH4 + 2O2----> CO2 + 2H2O

26. Mn -manganese: 54.93 g/mol

SF6= 146.06 g/mol

Sr(C2H3O2)2= 205.708 g/mol

27. true.

29. first two are decomposition reactions

third one is double displacement reaction.

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