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25-08-2018
Chemistry

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An element has an atomic number of 78. the number of protons and electrons in a neutral atom of the element would be _____.

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05-09-2018

78 and 78. An atom of the element has 78 electrons and 78 protons.

The atomic number is 78, so the atom has 78 protons (+).

If the atom is neutral, it must contain 78 electrons (-).

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