Question

question 14 (1 point)
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which of the following pairs has approximately the same mass?

1. a proton and an electron
2. a neutron and an electron
3. a ¹h atom and an electron
4. a ¹h atom and a neutron
5. a 1h atom and a 2h atom

Explanation:

Step1: Recall particle masses

The mass of a proton is approximately $1.6726\times 10^{- 27}$ kg, an electron is about $9.1094\times 10^{-31}$ kg, a neutron is around $1.6749\times 10^{-27}$ kg. A $^1$H atom consists of 1 proton and 1 electron. Since the mass of the electron is negligible compared to the proton, the mass of a $^1$H atom is approximately the mass of a proton. And the mass of a proton is close to the mass of a neutron. So a $^1$H atom and a neutron have approximately the same mass.

Answer:

1. A $^1$H atom and a neutron