Write the n, l, ml, and ms values for the first two elements, H and He.
H: n=1 l=0 ml=0 ms=+1/2
He: n=1 l=0 ml=0 ms=+1/2 for the first electron
for the second: n=1 l=0 ml=0 ms=-1/2
Are these correct?
Hannah, I answered your first post half an hour ago.
Thank you and sorry. Sometimes it does not show up on my computer when someone answers.
Mine does that too if I don't punch re-load. Get into the habit of punching the re-load key before you check an entry.
o ok thank you!!
Yes, your values are correct for the first two elements, H (hydrogen) and He (helium). Let me explain how these values are determined.
The values n, l, ml, and ms represent the quantum numbers associated with the electrons in an atom.
1. The principal quantum number (n) represents the energy level or shell in which the electron resides. It can take on integer values starting from 1. For hydrogen and helium, which are in the first row of the periodic table, the value of n is 1.
2. The azimuthal quantum number (l) determines the subshell the electron belongs to, and it ranges from 0 to (n-1). The subshells are labeled with the letters s, p, d, f, corresponding to l values of 0, 1, 2, and 3, respectively. For hydrogen and helium, the value of l is 0, indicating the s subshell.
3. The magnetic quantum number (ml) specifies the particular orbital within a subshell, and it can take on values from -l to +l. In the case of hydrogen and helium where l is 0, ml is also 0. This implies that the electron is in the s orbital, which has only one orientation.
4. The spin quantum number (ms) describes the spin state of the electron and can have values of +1/2 or -1/2. For the first electron in both hydrogen and helium, the value of ms is +1/2. However, for the second electron in helium, the value of ms is -1/2, indicating that it has an opposite spin to the first electron. This is due to the Pauli exclusion principle, which states that no two electrons in an atom can have the same set of quantum numbers.
So, to summarize:
For hydrogen (H): n=1, l=0, ml=0, ms=+1/2
For helium (He) first electron: n=1, l=0, ml=0, ms=+1/2
For helium (He) second electron: n=1, l=0, ml=0, ms=-1/2
Your values match with the expected values for these elements.