I have look and read and I still cant figure the couple out can someone please help? Number of orbital’s in the 2p subshell? And Number of electrons in 3d subshell? Number of electrons in a 3p orbital? Subshell block begins to fill after 4s2? Number of valence electrons in As?
see above.
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Sure, I can definitely help you with all of these questions. Let's go through them one by one and I'll explain how to find the answers.
1. Number of orbitals in the 2p subshell:
To determine the number of orbitals in a subshell, you can use the formula 2l + 1, where 'l' is the azimuthal quantum number representing the subshell. For the 2p subshell, the value of 'l' is 1. Plugging the value into the formula, we get 2*1 + 1 = 3. Therefore, there are 3 orbitals in the 2p subshell.
2. Number of electrons in the 3d subshell:
Similar to the previous question, you can use the formula 2l + 1 to find the total number of orbitals in the subshell. In the case of the 3d subshell, 'l' is equal to 2. Plugging this value into the formula, we have 2*2 + 1 = 5. Therefore, there are 5 orbitals in the 3d subshell. Since each orbital can hold a maximum of 2 electrons according to the Pauli exclusion principle, the total number of electrons in the 3d subshell is 5 * 2 = 10.
3. Number of electrons in a 3p orbital:
Each orbital can hold a maximum of 2 electrons. Therefore, a 3p orbital can hold 2 electrons.
4. Subshell block begins to fill after 4s2:
The order of filling subshells is based on the Aufbau principle, which states that lower energy subshells are filled before higher energy subshells. In terms of notation, the subshells are usually ordered as follows: 1s, 2s, 2p, 3s, 3p, 4s, 3d, etc. According to this sequence, the 4s subshell is filled before the 3d subshell. So, the subshell block begins to fill after the 4s2 subshell.
5. Number of valence electrons in As:
To determine the number of valence electrons in an element, you need to examine its electron configuration. The electron configuration of arsenic (As) is [Ar] 4s2 3d10 4p3, where [Ar] represents the electron configuration of argon (Ar). The outermost electron shell of As is the 4th shell (n=4), and the outermost subshell is the 4p subshell. The 4p subshell can hold a maximum of 6 electrons, but in the case of As, there are 3 electrons in the 4p subshell. Therefore, As has 5 valence electrons (3 electrons in the 4p subshell + 2 electrons in the 4s subshell).
I hope this helps in clarifying your questions. Let me know if there's anything else I can assist you with!