Complete the following statements regarding effective nuclear charge (Zeff) for the phosphorus atom: I. The Zeff for a valence electron in a phosphorus atom is [ Select ] less than equal to greater than the Zeff for a valence electron in a magnesium atom. II. The Zeff for a 1s electron in a phosphorus atom is [ Select ] equal to less than greater than the Zeff for a 2s electron in a phosphorus atom. 01A多重下拉选择题

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In a poly-electronic atom, the effective nuclear charge (Zeff) felt by the outermost electron must be larger than the nuclear charge (Z). 

Identify the following statements as either true or false: I: The 1s orbital of an Na atom is smaller than a 1s orbital of an Mg atom. [ Select ] II: In a Ni atom, the effective nuclear charge experienced by the 4s subshell is larger than the effective nuclear charge experienced by the 3d subshell. [ Select ] III: The effective nuclear charge experienced by the core electrons is larger for P than it is for Cl. [ Select ] IV: In an F atom, the effective nuclear charge experienced by an electron in the 2p subshell is larger than it is for an electron in the 2s subshell. [ Select ]

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What is the effective nuclear charge (Zeff) for a valence electron in an aluminum (Al) atom? (core electrons contribute 0.85 and valence electrons contribute 0.35 to the shielding value, S)

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