7. Element x has the valance electron with the following quantum numbers (ns3, l

Question

7. Element x has the valance electron with the following quantum numbers (ns3, la2, ma-2, m, +1/2). What is element X? a. Calcium b. Gallium c. Aluminum d. Scandium 8. Which of the following in considered a basic oxide? a. CO2 b, OF C. Cao d. None of the above 9. Which of the following statements is correct? a. Carbon can be found in three forms (chalk, graphite and diamond) b. As the size of the halogen increase, the reactivity increases c. Sulfur can be found as a yellow rock with a formula of Ss d. All of the above statements are correct 10. The correct electron configuration for As" is: a. IArl 3d 10 4s24p3 Arl 4s24d'e 4p d. None of the above c. [Ar] 4s' 3d'"

Explanation / Answer

Answer 7: n = 3 means 3rd quantum number. l=2 means d orbital. mi=2 means on the 4th subshell means it can be either 4th or 9th electron.

So, electron is in 3d orbital.

valence shell of calcium is 4s, for gallium is 4p, for aluminium is 3p and sacndium is 3d.

So, the answer is d, Scandium

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