If an element gains an electron, will it form a positive ion or a negative ion?

Negative Ion An atom on gaining an extra electron will acquire one unit of negative charge. An atom has equal number of protons and electrons. The total positive charge of protons balance out the total negative charge of electrons.

If an atom is electrically neutral, how can it be changed? - Quora

What is an ion?

How are ions formed?

Chemical Bonding Review Worksheet, PDF, Ionic Bonding

3.1: Ions - Losing and Gaining Electrons - Chemistry LibreTexts

Bio Review Notes

Ion Examples With Positive & Negative Charges

Chemical Bonding Review Worksheet - Chemical Bonding Review

2.03 Chemical Bonding

Chemistry bonding Flashcards

Introduction to ions (video)