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Answer: Cs because its further to the right on the table, meaning its more reactive.

Explanation:

Answer:

Cs

Explanation:

This element is the farthest right, and lowest meaning that its reactivity is very high.

1. valence electrons and electronegativity

2. Both reactivity and electronegativity decrease down a group.

3. Electronegativity decreases down a group and reactivity increases down a group.

4. The number of valence electrons increases from left to right.

5. Cs

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