Question

1. calcium reacts with a certain element to form a compound with the general formula cax₂. what would be the most likely formula for a compound formed between sodium and element x? a. na₂x b. na₂x₂ c. na₃x₂ d. nax

Explanation:

Step1: Determine calcium's valence

Calcium forms $CaX_2$, so its valence is +2.

Step2: Find sodium - X formula

Sodium has a valence of +1. To balance charges with X (valence - 2 from $CaX_2$), formula is $Na_2X$.

Answer:

b. $Na_2X$