To find the mass of 1,000 protons in scientific notation, we can express the given value \( 1.67 \times 10^{-21} \) grams, which represents the mass of a single proton, in terms of 1,000 protons.
The mass of one proton is approximately \( 1.67 \times 10^{-24} \) grams. Therefore, the mass of 1,000 protons would be:
\[ 1,000 \times 1.67 \times 10^{-24} = 1.67 \times 10^{-21} \text{ grams} \]
Since you already computed the mass of 1,000 protons to be \( 1.67 \times 10^{-21} \) grams, the answer in scientific notation is:
\[ 1.67 \times 10^{-21} \text{ grams} \]
So, the mass of 1,000 protons in scientific notation is \( \boxed{1.67 , \text{x}} \).
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