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What is the number of protons neutrons and electrons in an atom of zirconium 90 that has overall charge and an atomic number of 40?
Wiki User
∙ 12y ago
Zirconium-90 (90Zr) has the atomic number 40, and it has 40 protons. The question asked about a specific isotope of zirconium, and the 90 in this isotope represents the number of protons plus the number of neutrons in 90Zr. The math is simple, and 90 minus 40 tells us there are 50 neutrons in this atom. As the atom was said to be electrically neutral, so that means the number of electrons will be equal to the number of protons. The atom will, therefore, have 40 electrons.
Wiki User
∙ 16y ago
Wiki User
∙ 12y agoBecause atoms are classified by the number of protons, zirconium 90 has 40.
So,
Electrons: 40
Protons:40
Neutrons:50 (Because the '90' just means neutrons + protons.)
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Atomic number gives the number of protons: 40. If the atom is neutral, it must have an equal number of protons and electrons. Therefore, the number of electrons is also 40. The isotope number is the same thing as the atomic mass. Atomic mass is basically the sum of protons and neutrons. Therefore, subtracting the number of protons from the atomic mass yields the number of neutrons: (90 - 40 = 50). Thus, there are 50 neutrons.
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