To find the mass of 1,000 protons, we can start by understanding the calculator's output: 1.67E - 21 means \(1.67 \times 10^{-21}\) grams.
If this value represents the mass of 1 proton, to find the mass of 1,000 protons, we multiply by 1,000:
\[ \text{Mass of 1,000 protons} = 1,000 \times (1.67 \times 10^{-21}) \]
Calculating this:
\[ 1,000 = 10^3 \]
So,
\[ \text{Mass} = 1.67 \times 10^{-21} \times 10^3 = 1.67 \times 10^{-21 + 3} \]
This simplifies to:
\[ 1.67 \times 10^{-18} \]
Therefore, the mass of 1,000 protons in scientific notation is:
\[ \boxed{1.67 \times 10^{-18}} \text{ grams.} \]
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