Which of the following is correct about Z effective for an element ? A . z eff is same for (ns,np) electron. B. Z eff is same for (nd,nf) election. C. Screening constant is not same for (ns,np) electron. D. Screening constant is same for (nd,nf) electron.?

Question

Answer

Z Effective for an Element

Z effective, also known as effective nuclear charge, is the net positive charge experienced by an electron in an atom. It is affected by the number of protons in the nucleus and the shielding effect of inner electrons. The correct statement about Z effective for an element is:

Screening Constant and Electron Configuration

The screening constant is the measure of how effectively the inner electrons shield the outer electrons from the nuclear charge. It varies depending on the electron configuration of the atom. The correct statements are:

- Screening constant is not the same for (ns,np) electron: The ns and np electrons have different screening constants because they experience different levels of shielding from the inner electrons. The np electrons are farther from the nucleus and experience less shielding than the ns electrons. Therefore, the screening constant for np electrons is lower than that for ns electrons.
- Screening constant is the same for (nd,nf) electron: The nd and nf electrons have the same screening constant because they are both in the d and f subshells, which are shielded by the same number of inner electrons. Therefore, the screening constant for nd and nf electrons is the same.

Conclusion

Z effective is an important concept in understanding the behavior of electrons in atoms. It is affected by the number of protons in the nucleus and the shielding effect of inner electrons. The screening constant varies depending on the electron configuration of the atom, and it is different for ns and np electrons but the same for nd and nf electrons.

Answer

C.

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