A certain element has 52 protons, 52 electrons, and 76 neutrons. its atomic mass is _____. 52 76 128 104
2 answers:
Answer:
Atomic mass is 128
Explanation:
Atoms are composed of fundamental subatomic particles: protons, neutrons and electrons.
They are represented by a standard nuclear notation which includes the symbol of the element, its atomic number and atomic mass.
i.e.
Z = atomic mass = number of protons + number of neutrons -----(1)
A = atomic number = number of protons = number of electrons----(2)
<u>Given data:</u>
Protons = 52
Electrons = 52
Neutrons = 76
Based on equation (1)
Atomic mass = 52 + 76 = 128
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Answer:
C) 4.
Explanation:
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In this case, since the electron configuration of nickel at its ground-state, considering 28 as its atomic number and the number of electrons it has in one atom, is:
We can see it has four energy levels, 1, 2, 3 and 4, which are related to the following principal quantum number, that describes the energy of an electron in the atom and its most probable distance with respect to the nucleus.
Therefore, nickel has C) 4 different principal quantum numbers.
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