Question

1. how many protons, neutrons, and electrons are in uranium - 235 with an atomic number of 92?

92 protons, 92 electrons, 92 neutrons
92 protons, 92 electrons, 143 neutrons
92 protons, 143 electrons, 143 neutrons
143 protons, 143 electrons, 92 neutrons

Explanation:

Step1: Determine the number of protons

The atomic number \(Z\) of an element is equal to the number of protons. Given that the atomic number of uranium is \(92\), so the number of protons \(p = 92\).

Step2: Determine the number of electrons

In a neutral atom, the number of electrons \(e\) is equal to the number of protons. So \(e=92\).

Step3: Determine the number of neutrons

The mass number \(A\) of uranium - 235 is \(235\). The formula for the mass number is \(A=p + n\) (where \(n\) is the number of neutrons). Rearranging the formula to solve for \(n\), we get \(n=A - p\). Substituting \(A = 235\) and \(p = 92\) into the formula, we have \(n=235-92=143\).

Answer:

92 protons, 92 electrons, 143 neutrons