2000
Explanation
An atom consists of fundamental subatomic particles: protons, neutrons, and electrons. The mass of the atom is concentrated in the nucleus (protons and neutrons), while electrons have a negligible mass in comparison.
Analysis:
- The mass of a proton ($m_p$) is approximately $1.67 \times 10^{-27}$ kg ($1.007$ u).
- The mass of an electron ($m_e$) is approximately $9.11 \times 10^{-31}$ kg ($0.00055$ u).
- Calculating the ratio of the mass of a proton to that of an electron:
$$ \frac{m_p}{m_e} \approx \frac{1.67 \times 10^{-27}}{9.11 \times 10^{-31}} \approx 1836 $$ - Thus, a proton is approximately 1836 times heavier than an electron. Among the given options, 2000 is the closest approximation.
Key Takeaway:
A proton is approximately 1836 times heavier than an electron. In general approximations, this ratio is often cited as roughly 2000:1.