There six electrons in carbon atom,
2 in the first shell and 4 in the second shell.
Four.
The same as the number of protons, which is its atomic number, 6.
5
Uranium has 92 electrons.
Hydrogen only has 1 electron.
14 total electrons. 5 valence electrons.
There are three valance electrons. These are the electrons in the outer shell if it is not full.
ions
The third level of an atom can hold a maximum of 18 electrons.
The atomic number of iodine is 53. So there will be 53 protons in the nucleus. For iodine atom to be neutral there will 53 electrons in total.
I believe it was Niels Bohr.
Two of each subatomic particle listed in the question.