To find the mass of 1,000 protons in scientific notation, we first note that the mass displayed is \( 1.67 \times 10^{-21} \) grams. This represents the total mass of 1,000 protons.
To convert this to scientific notation, we need to express it in terms of the mass of a single proton. The mass of one proton is approximately \( 1.67 \times 10^{-27} \) grams. The mass of 1,000 protons can be calculated as follows:
\[ 1000 \text{ protons} = 1000 \times (1.67 \times 10^{-27}) \text{ grams} \]
Calculating this, we first write 1000 in scientific notation:
\[ 1000 = 10^3 \]
So we can combine it:
\[ 1000 \times (1.67 \times 10^{-27}) = 1.67 \times 10^3 \times 10^{-27} \]
Next, we add the exponents:
\[ 1.67 \times 10^{3 - 27} = 1.67 \times 10^{-24} \]
Thus, the mass of 1,000 protons in scientific notation is:
\[ \boxed{1.67 \times 10^{-24}} \text{ grams} \]
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