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Which of the following statements is/are INCORRECT?
1. A neutron is an uncharged particle with a mass slightly greater than a proton.
2. The nucleus of an atom has a negative charge.
3. More than 99.9% of an atom's mass is concentrated in the electron cloud surrounding the nucleus.
A. 1 only.
B. 2 only.
C. 3 only.
D. 1 and 3.
E. 2 and 3.



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