⁵He and ⁴He are isotopes
F¹⁻ is the negative ion of F
Explanation:
⁵He and ⁴He are isotopes because they have different number of neutrons.
⁵He have 3 neutrons
⁴He have 2 neutrons
F¹⁻ is the negative ion of F, because it has the same number of protons but different number of electrons.
F¹⁻ have 9 protons and 10 electrons, so it have a negative 1 charge
F have 9 protons and 9 electrons so it is neutral
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isotops
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