Q: 3s23p5 and t: 4d105s25p5 in the same period

False

Explanation:

Electronic configuration is the short representation of the structure of an atom.

Atomic number = number of electrons = number of protons.  

Example  

Atomic number of phosphorus is 15 so it has 15 electrons. The electronic configuration of Phosphorus is given as

Here the superscript number represents the electrons 2 + 2 + 6 + 2 + 3 = 15 Electrons of Phosphorus.

The elements present in the same group will have same number of valence electrons (outer shell electrons)

For example  

Fluorine,Chlorine,Bromine are all present in the same Group

The electronic configuration are  

The elements present in the same period will have same number of shells

For example  

Sodium, Magnesium, Aluminium, silicon, Phosphorus, sulfur, chlorine, Argon  

All these elements are present in the same 3rd period and the number of shells = 3

The electronic configurations are

the answer to your question is c