how to calculate neutrons in 99Tc43
mass number = number protons + number neutrons.
99 = 43 + ?
To calculate the number of neutrons in an atom, you need to know the atomic number and the mass number of the atom.
The given isotope is 99Tc43. Here, "99" represents the mass number and "43" represents the atomic number.
The atomic number denotes the number of protons in an atom. In this case, Tc has an atomic number of 43, meaning it has 43 protons.
The mass number represents the total number of protons and neutrons in the atom. In this case, the mass number is 99.
To calculate the number of neutrons, subtract the atomic number (proton count) from the mass number (proton + neutron count).
Number of neutrons = Mass number - Atomic number
= 99 - 43
= 56
Therefore, the isotope 99Tc43 has 56 neutrons.