An unknown element having electronic configuration [Ne] 5s2 5p5 will be.
Correct answer: C. Non-metal of VII-A group
- A. Metal of II-A group
- B. Metalloid of V-A group
- C. Non-metal of VII-A group
- D. Non-metal of V-A group
Explanation
The electronic configuration [Ne] 5s2 5p5 indicates that the unknown element has:- A noble gas core (Ne)- 2 electrons in the 5s orbital- 5 electrons in the 5p orbitalThis configuration corresponds to a halogen, specifically Astatine (At), which is a non-metal in group VII-A (17) of the periodic table.
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Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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