To determine which elements would lose electrons when they become ions, we'll assess whether each element typically forms cations (loses electrons) or anions (gains electrons) during ionization. Let's analyze each of the elements provided:
1. Hydrogen (H): When ionized, hydrogen typically loses one electron to form a [tex]\( H^+ \)[/tex] cation.
2. Helium (He): Helium, a noble gas, is very stable and does not usually form ions because it has a full valence shell.
3. Iron (Fe): Iron is a metal and commonly forms cations by losing electrons, typically forming [tex]\( Fe^{2+} \)[/tex] or [tex]\( Fe^{3+} \)[/tex] ions.
4. Fluorine (F): Fluorine is a non-metal and typically gains one electron to form an [tex]\( F^- \)[/tex] anion.
5. Gallium (Ga): Gallium is a metal and typically loses electrons to form [tex]\( Ga^{3+} \)[/tex] cations.
From this analysis, the elements that lose electrons when they form ions are:
- Hydrogen (H)
- Iron (Fe)
- Gallium (Ga)
Thus, the elements which lose electrons when becoming ions are:
- I. Hydrogen
- III. Iron
- V. Gallium
Therefore, the correct indices are 1, 3, and 5.
This means the elements that lose electrons when becoming ions are:
[tex]\[ [1, 3, 5] \][/tex]
