Question

if a fluorine atom gains 1 electron, it would become f⁻ f⁺ o ne

Explanation:

Step1: Understand ion - formation

Atoms gain or lose electrons to form ions. A neutral atom has equal number of protons and electrons.

Step2: Analyze fluorine's electron - gain

Fluorine (F) has 9 protons and 9 electrons in its neutral state. When it gains 1 electron, the number of electrons becomes 10 while the number of protons remains 9.

Step3: Determine the ion symbol

Since it has 1 more electron than protons, it has a negative charge of 1. The symbol for a fluorine ion with a - 1 charge is $F^-$.

Answer:

$F^-$