Which of the following is not the electronic configuration of a non-metal?
2,8,4
2,8,4 is correct.
Read each configuration and identify the element from its atomic number: 2,8,6 is sulphur (Z = 16, non-metal); 2,8,7 is chlorine (Z = 17, non-metal); 2,8,4 is silicon (Z = 14); and 2,8,5 is phosphorus (Z = 15, non-metal).
Silicon has four valence electrons and is classified as a metalloid, not a non-metal, because it shows metallic lustre, acts as a semiconductor and has intermediate chemical behaviour. The remaining three elements are typical non-metals of Group 15, 16 and 17, so the configuration 2,8,4 is the odd one out.
Similar Questions
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Important Questions from Classification of Elements and Periodicity in Properties
- Which one of the following statements about alkaline earth metals is NOT true ?
- What element is a greenish yellow gas with a characteristic smell at room temperature?
- In the periodic table, as one goes down the group, which property doesn't change?
- Which of the following is a copper ore?
- Which scientist invented the Periodic table?
