An atom has 35 nucleons and has atomic number equal to 17. The number of electrons with n = 2, I = 0 in it is:

Explanation

Option A is correct.The number of electrons with n = 2, l = 0 in an atom with 35 nucleons and an atomic number of 17 is 2. The principal quantum number (n) tells us the energy level of the electron, and the angular momentum quantum number (l) tells us the shape of the orbital. The value of n = 2 tells us that the electron is in the second energy level, and the value of l = 0 tells us that the orbital is an s orbital. The s orbital in the second energy level can hold up to 2 electrons, so the number of electrons with n = 2, l = 0 in an atom with 35 nucleons and an atomic number of 17 is 2. Here is the electron configuration of chlorine, which has an atomic number of 17: 1s2 2s2 2p6 3s2 3p5 The electrons with n = 2, l = 0 are the 2s2 electrons. There are 2 of these electrons in chlorine, so the answer is 2.