an element becomes a positively charged ion when it\nloses protons.\nloses electrons.\ngains…

Brief Explanations:

Atoms are neutral with equal protons and electrons. Losing electrons leaves more protons than electrons, creating a positive - charge. Protons are in the nucleus and not easily lost in normal chemical processes. Gaining electrons makes an atom negatively charged. Neutrons have no charge, so gaining neutrons doesn't change the charge.

Answer:

loses electrons.