Question

perty do the following elements have in common?
dine, and magnesium
a same phase at room temperature
b good conductors of electricity
c same number of valence electrons
d they form cations (positive ions)

Explanation:

Assuming the elements are sodium (Na), iodine (I), and magnesium (Mg) (correcting possible typo "odine" to "iodine"):

• Option A: Sodium (metal, solid), magnesium (metal, solid), iodine (non - metal, solid) at room temperature. So they have the same phase (solid) at room temperature.
• Option B: Iodine is a non - metal and a poor conductor of electricity, while sodium and magnesium are good conductors. So this is incorrect.
• Option C: Sodium has 1 valence electron, magnesium has 2, iodine has 7. So different number of valence electrons. Incorrect.
• Option D: Iodine typically forms anions (negative ions), while sodium and magnesium form cations. Incorrect.

Answer:

A. Same phase at room temperature