Which one is? Will give brainliest

Answer is in the file below

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2Cr + 3Br2 Yields 3CrBr3

Explanation:

We know that 4a is not balanced because there are 3 Nitrogen atoms on the reactants side and 2 on the products side.

We know that 4c is not balanced because there are 4 Chlorine atoms on the reactants side and 2 on the products side. (Remember there are 2 Cl2 atoms. Therefore, 2 times 2 means there are 4 Chlorine atoms on the reactants side)

Finally, we know the answer is not 4d because there is 1 Potassium on the reactants side and 2 potassiums on the products side.

Therefore, the answer must be 4b, which contains 2 Chromium atoms and 6 bromine atoms on each side

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.