1) Choose the correct answer why when across a period, atomic radius will decrease a) Proton number decrease b) Effective nuclear charge decrease c) Nucleus-electron valence increase d) Atomic size become larger 2) All of the answer below are Factor Affecting the ionisation energy EXCEPT a) Atomic radius b) Electronegativity c) Effective nuclear charge d) Screening effect 3) When across a period 3, which ion from each elements have smaller ionic radii a) Na b) Si c) Al d) Mg 4) Effective nuclear charge for Oxygen,O a) +4 b) +2 c) +6 d) -8 5) All below are the reasons why when down a group, electronegativity  will decrease EXCEPT a) Atomic size increase b) Number of shell increase c) Nucleus-Electron valence weaker d) Screening effect decreases

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