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Electrons shell configuration help?

how do i find the electron configuration, bohr model, number of neutrons, elections, and protons, in these elements. Xenon, Sodium, Cobalt, Oxygen, Bromine, Gold, Helium, Uranium, Arsenic and Chromium.

First let’s tackle the number of sub-atomic particles:

In order to find the number of protons in an atom of a certain element, you need to know it’s atomic number. The atomic number is it’s proton count (ex. Hydrogen – 1 (1 proton), Helium – 2 (2 protons) etc.)

In order to find how many neutrons are present in a nucleus, you need to subtract an atom’s atomic number (number of protons) from its mass number (number of protons and neutrons). Problem is, most periodic tables do not include the element’s mass number. But you can find it by rounding the atomic weight of the element to the nearest who number.

The number of electrons is the same as the number of protons (atomic number) in any neutral atom.

The electron configuration, however, is not as simple as the other things. You must know that the atom’s electron cloud is organized into sub-levels and orbitals. This is rather complicated, so I would check your textbook for the best explanation.

The Bohr model of an atom is a representation of the nucleus (with the number of protons and neutrons located inside), surrounded by the different sub-levels of the electron cloud. (For example, Hydrogen has 1 electron. Therefore, that electron is located in the first sub-level (1s). This would be represented by a circle located around the nucleus, with a “1e-” labeled somewhere on it (or something to that effect.)

For a detailed explanation of electron configuration/Bohr models, I would check your textbook.