Question

The sub- shells filled one by one for 4 period elements are?
A- 3d,4s,&4p
B-4s,4p&4d
c-4s,3d&4p
d-3d,4p&4s​

Answer 1

The sub-shells filled one by one for 4-period elements are 4s,3d&4p.

The 4th-period elements are also known as transition elements and include nickel, copper, manganese, iron, and titanium.

What are subshells?

• The division of shells i.e K, L, M, and N into further smaller compartments or shells is called sub-shells.
• All the sub-shells are separated by the electron orbitals in an atom.
• An atom can have four types of subshells named s, p, d, and f.
• The fourth-period elements having atomic number 18 have four subshells namely 4s,3d and 4p.
• 4s contains 2, 3d 10 and 4p 6 electrons respectively.

So, the correct option is C.

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