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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.
Sagot :
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