June 2010 Chemistry Regents #54-55

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Base your answers to questions 54 and 55 on the information below. An atom in an excited state has an electron configuration of 2-7-2. 54 Explain, in terms of subatomic particles, why this excited atom is electrically neutral. [1] HIGHLIGHT TO SEE THE ANSWER NOTE="Atoms" are neutral The number of protons equals the number of electrons. The atom has 11 protons and 11 electrons. 55 Write the electron configuration of this atom in the ground state. [1] HIGHLIGHT TO SEE THE ANSWER 2-8-1   Next Questions

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