Question

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Explanation:

Step1: Recall electronegativity trend

Electronegativity increases across a period and up a group. The top - right elements (excluding noble gases) have high electronegativity. Fluorine (F) is in Group 7A (halogens), period 2. It is the most electronegative element.

Step2: Recall reactive metals trend

For metals, reactivity increases down a group and to the left of the periodic table. Alkali metals (Group 1A) are the most reactive metals as they have 1 valence electron and easily lose it to form cations.

Answer:

1. Fluorine (F)
2. Group 1A (Alkali metals)