usually it is the second to third layer of electrons. it depends on what atom ur talking about, some atoms (like magnesium) have 3 electron levels; when some atoms (like gold) may have over 7 levels of electrons. it sometimes has to do with the atomic number
The nucleus is significantly more dense than the electron cloud. The nucleus contains most of the mass of an atom, while the electron cloud occupies a much larger volume with a very low density.
The electron cloud or electron shell
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The electron cloud contributes the most volume of an atom. While the nucleus contains most of the atom's mass, it occupies a very small space compared to the vast area of the electron cloud, where electrons are found. The electron cloud's size is determined by the energy levels and orbitals of the electrons, making it the dominant contributor to the overall volume of an atom.
It is impossible to know exactly where an electron is. Thus, the size of an electron cloud can be given only in terms of probability. Even then, the size of the electron cloud depends on how many electrons an atom possesses.
The nucleus is significantly more dense than the electron cloud. The nucleus contains most of the mass of an atom, while the electron cloud occupies a much larger volume with a very low density.
the electron cloud is least dense where the probability of finding an electron is LOWEST
Speaking very generally, most atoms consist of a dense nucleus which contains protons and neutrons, and an electron cloud away from the nucleus which contains electrons.
The electron cloud or electron shell
The size and shape of an electron cloud are most closely related to the electron's energy level and angular momentum, which determine the orbitals in which the electrons are most likely to be found. The electron cloud represents the region where there is a high probability of finding the electron at any given time.
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That would be the electron cloud. This is like the orbital model where there are electrons in each orbit level but the electron's location can not be predicted so it is said to be most likely at a point in the electron cloud.
An electron cloud is an atomic orbital.
Cloud...
Cloud...
The electron cloud is probably the least dense part of an atom. The electron is certainly the smallest individual component of an atom, but electrons are in motion. And because they are in motion, they describe the volume of the atom. Additionally, they describe a huge volume compared to their size. That translates into the electron cloud "taking up lots and lots of room" but being populated by only a few electrons. The electron cloud has a very, very low density.
The nucleus is the most dense part of an atom.