A compound is found to contain 1.245 g Nickel and 5.381 g Iodine. It’s empirical formula is

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explanation:

the answer to your question is c.

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1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.