The number of electrons in a neutral atom is the atom's
atomic number. For the given list of elements the symbols and the atomic number can be
seen from the periodic table. The relevant details have been provided
here:
Uranium has the symbol U and the number of electrons
is 92
Boron has the symbol B and the number of electrons is
5
Antimony has the symbol Sb and the number of electrons is
51
Chlorine has the symbol Cl and the number of electrons
is 17
Iodine has the symbol I and the number of electrons
is 53
Xenon has the symbol Xe and the number of electrons
is 54
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