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1. Describe and explain the trend of the ionization energy of elements: (i) across a period;...

1. Describe and explain the trend of the ionization energy of elements: (i) across a period; (ii) down a group, in the periodic table.

2. Reactivity of alkali metals (Group 1A) increases from top to bottom down the group, but the reactivity of halogen (Group 7A) decreases from top to bottom down the group. Explain why the difference.

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