The correct statement about an electron is that it has a negative charge.
The other statements are not true:
- An electron is not located in the nucleus; it exists in the electron cloud surrounding the nucleus.
- An electron has a mass of approximately 1/1836 amu, which is much less than 1 amu.
Therefore, the option "All of these are true" is false. The only true statement is that an electron has a negative charge.
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