1. Since Francium is on the lowest row and the first column, it has seven shells and 87 electrons, one of which is a valence electron. Since the electrons are far away from the nucleus, it is easier to lose an electron.
2. Since Helium only has one energy shell, it is harder to lose an electron since it is so close to the nucleus.
3. Since the noble gases have 8 valence electrons, they are already stable without having to gain an electron.
4. Since the space between the nucleus and the valence electrons is so small, it is easy for Fluorine to gain an electron
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