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stellarik [79]
3 years ago
12

The atomic number of an element is determined by the number of electrons in the nucleus of the atom.

Chemistry
2 answers:
iren [92.7K]3 years ago
7 0
A
The number of electrons/protons is the one that determines the atomic number of an element.
never [62]3 years ago
3 0
True beacuse the number of electrons is the atomic number
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Nuclear power plants produce energy using fission. One common fuel, uranium-235, produces energy through the fission reaction 23
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Answer:

mass of U-235  = 15.9 g (3 sig. figures)

Explanation:

1 atom can produce -------------------------> 3.20 x 10^-11 J energy

x atoms can produce ----------------------> 1.30 x 10^12 J energy

x = 1.30 x 10^12 / 3.20 x 10^-11

x = 4.06 x 10^22 atoms

1 mol ----------------------> 6.023 x 10^23 atoms

y mol ----------------------> 4.06 x 10^22 atoms

y = 0.0675 moles

mass of U-235 = 0.0675 x 235 = 15.8625

mass of U-235  = 15.9 g (3 sig. figures)

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3 years ago
Why is density referred to as a characteristic property of matter?
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Density does not varies with the concentration. The formula for density is mass / volume.


So if the mass changes the density will change accordingly, also if the volume changes the density will get changed.


because, of the above reasons density is referred as a characteristic property of matter.

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