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The electronic configuration of the element which is just above the element with atomic number 42 in the same group
  • a)
    [Ar] 3d4s2
  • b)
    [Ar] 3d4s1
  • c)
    [Ar] 3d5 4s1
  • d)
    [Ar] 3d10 4s1
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The electronic configuration of the element which is just above the el...
The element with atomic number 42 is molybdenum (Mo), which belongs to group 6 of the periodic table. We need to find the electronic configuration of the element just above molybdenum in the same group.

Step 1: Determine the location of the element
To find the element just above molybdenum, we need to look at the periodic table. Molybdenum is located in period 5 and group 6. The element just above it will be in period 4 and group 6.

Step 2: Determine the electronic configuration of molybdenum
The atomic number of molybdenum is 42, which means it has 42 electrons. To determine its electronic configuration, we fill up the orbitals in the order of increasing energy.

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d5

Step 3: Determine the electronic configuration of the element just above molybdenum
Since the element just above molybdenum is in period 4, it will have one less shell than molybdenum. Therefore, we can start the electronic configuration with [Ar], which represents the noble gas configuration of argon (the element in period 3 just before period 4).

[Ar]

Next, we need to add the remaining electrons to complete the configuration. In group 6, there are 6 valence electrons.

The general electronic configuration for group 6 elements is ns2np4.

Therefore, the electronic configuration of the element just above molybdenum is:

[Ar] 3d5 4s1

The correct answer is option C, [Ar] 3d54s1.
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Community Answer
The electronic configuration of the element which is just above the el...
The element lying above Z = 42 has Z value 24, i.e. chromium. Hence, Cr configuration is [Ar]3d54s1
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