To determine the atomic number and mass number of an atom from the given information, we need to consider the charge on the atom.
The atomic number (Z) represents the number of protons in the nucleus of an atom. Since the given atom has a charge of 7+, it means that there are 7 more protons than electrons. Therefore, the atomic number is:
Atomic number (Z) = Complementary atomic number - Charge = 43 - 7 = 36
The mass number (A) represents the total number of protons and neutrons in the nucleus. To find the number of neutrons, we subtract the atomic number (Z) from the mass number (A):
Neutrons = Mass number (A) - Atomic number (Z) = 99 - 36 = 63
Therefore, the complementary atom with an atomic number of 36, mass number of 99, and a charge of 7+ has 36 protons, 63 neutrons, and 29 electrons.