[exercise] ESSAY SECTION B ;D goodluck

hey, cuti tu, cuti gak... jgn lupe bce bku CHEM. ;D
jom try jwb soklan neyhh. ;DD

ELEMENT	NUCLEON NUMBER	PROTON NUMBER
X	24	12
Y	12	6
Z	16	8

• to achieve the stable octet electron arrangement of a duplet or an octet electron arrangement [1]
• Atom X will release 2 electrons to form X 2+ ion to achieve stable electron arrangement [1] Z + 2e- -> Z2-
• the two electrons will be accepted by Z atom to form an Z2- ion [1] X -> X2+ + 2e-
• the positive & negative ions are attracted togeteher by strong electrostatic force, which is called as ionic bond [1]

• Atom Y has 4 valance electrons; Atom Z has 6 valence electrons [1]
  
  
• Atom Z needs 2 electrons meanwhile atom Y needs 4 electrons to achieve stable electron arrangement [1]
• Atom Z contributes 2 electrons for sharing while atom Y contributes 4 electrons for sharing
• two Z atoms each will share their 4 valence electrons with 4 valence electrons in one atom Y 2 pairs of electron with one atom Y [1]
• a double covalent bond formed between Y and Z [1]
  
• A molecule with the formula YZ2 is formed
  

• the ionic compound is formed between X and Z is melted. two carbon electrodes are placed in solution XZ [2]
  
• when the switch is on, a reading on the ammeter is observed to show that it conducts electricity [1]
• when ionic compounds are molten or dissolve in water, the ions of the compounds can move about. the moving ions carry the electrical current. in the solid state, the ions cannot move, so the current cannot flow [2]

hope u guys are satisfied wif this answer scheme. ;DD

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