Section A. Multiple Choice 30 te your letter answer in the boxes to the left of

Question

Section A. Multiple Choice 30 te your letter answer in the boxes to the left of the question. leaible answers will be counted as incorrect Bpts) A1. A cation is: ta] lb] [c] [d] An atom that has gained a small number of electrons An atom that has lost a small number of electrons A charged atom stable in solutions A feline that touched a live electrical wire Which of the following is a valid electronic configuration for Crs*? 3pts A2. b] 1s2 2s2 2p6 3s2 3p6 [c] 1s2 2s2 2p6 3s2 3p6 4s1 3d (d] 1s2 2s2 2p6 3s 3p6 4s2 3d (e] none of the above Bpts) An atom with the electronic structure 1s 2s2p 3s3p6 4s2 3d104p6 5s2 is a: [a] Halogen [b] Alkali [c] Alkaline Earth [d] Transition metal (e] Inert gas

Explanation / Answer

A1: A cation is a charged atom that has lost a small number of electrons. option B is correct

Explanation: An atom loses electrons and forms a positive charge which is called cation.

A2: none of the above is a valid electronic configuration of Cr5+. option E is correct

Explanation: The electronic configuration of Cr is 1s22s22p63s23p64s13d5

Cr5+ loses 5 electrons and the configuration is 1s22s22p63s23p64s03d1 . It is not given in any of the options. so none of the above is the answer.

A3: It is an Alkaline earth metal. option C is correct

Explanation: The number of electrons in atom are 38. The element with 38 electrons is strontium. strontium is Alkaline earth metal.

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