An atom of element Y has: an atomic number of 9 and a mass number of 19.

An atom of element Y has: an atomic number of 9 and a mass number of 19. Give the number of electrons and the number of neutrons in this atom.

Element Y is identified by its atomic number of 9, which indicates the number of protons present in the nucleus of the atom. Since atoms are electrically neutral, the number of electrons in an atom is equal to the number of protons. Therefore, element Y has 9 electrons surrounding its nucleus.

The mass number of element Y is 19, which is the sum of the number of protons and neutrons in the nucleus of the atom. Given that the atomic number is 9, we can deduce that there are 9 protons in the nucleus. By subtracting the atomic number from the mass number, we can determine that there are 10 neutrons in the nucleus of element Y.

In summary, element Y has 9 electrons, 9 protons, and 10 neutrons. The electrons are located in energy levels surrounding the nucleus, while the protons and neutrons are contained within the nucleus. This configuration gives element Y its unique chemical and physical properties, distinguishing it from other elements on the periodic table.

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