Li-3 protons
Br-35 protons
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Helium: He, 2 protons. Oxygen: O, 8 protons. Iron: Fe, 26 protons. Gold: Au, 79 protons.
Depends on the atom. The atomic number will give you the number of protons. The atomic weight will give you approximately the number of protons and neutrons combined.
Kr and 36 protons
The symbol for an atom is typically written with the element's symbol and the atomic number as a subscript (number of protons) and the mass number as a superscript (total number of protons and neutrons). Therefore, the symbol for an atom with 107 protons and 155 neutrons would be 107 Ag (silver).
The number of protons in an atom is equal to the atomic number, which corresponds to the position of the element in the periodic table. To find the number of neutrons, you subtract the atomic number from the atomic mass. The number of electrons is typically equal to the number of protons in a neutral atom.
The mass number of an atom is equal to the sum of its protons and neutrons. It is represented by the letter "A" in the chemical symbol notation, where A = number of protons + number of neutrons in the nucleus of the atom.