Platinum is in the 6th period, meaning its atom has 6 energy shells. It is in Group 10 and has 78 electrons.
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A neutral xenon atom has 54 electrons. Two of its electron shells would be completely filled, with 2 and 8 electrons, leaving 44 electrons in the remaining electron shells.
Calcium has 20 electrons in its electronic configuration, therefore it has 20 shells.
Beryllium has one outer electron shell with two electrons.
When it has no charge there are 78.the number of electrons is always equal to the number of protons, both are the atomic number. the atomic number of platinum is 78, so 78 electrons and 78 protons too.
The electronic configuration by shell for the element Platinum is the same as the filled shells of Xenon (q.v.), plus the following added: 14 electrons in the 4f shell, 9 in the 5d shell, and one in the 6s. Note that protons do not occupy shells in the atom but are bound in the nucleus.
iron has 4 shells because there are 30 electrons.
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Tungsten has 74 electrons!!
More the number of shells in an atom, more away will be the electrons from the nucleus. Hence, weaker will be the attraction between nucleus and outermost electrons. So atom with more shells will let go their electrons easier than atoms with fewer shells.
Mercury has 80 electrons which means there are 6 shells in a neutral atom of mercury.
A correct Bohr model of platinum shows the nucleus at the center, surrounded by electron shells. Platinum has 78 electrons arranged in energy levels/shells of 2, 8, 18, 32, 17, 1, with the last electron in the outermost shell. The Bohr model helps visualize the electronic configuration and the distribution of electrons in an atom.
Berkelium has 97 electrons, which means it has 7 electron shells.
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A neutral xenon atom has 54 electrons. Two of its electron shells would be completely filled, with 2 and 8 electrons, leaving 44 electrons in the remaining electron shells.
Uranium has 92 electrons, which means it has 7 electron shells.
There are 4 shells in 20 electrons: 2 electrons in the first shell, 8 in the second, 8 in the third, and 2 in the fourth shell.