Question

Si, p, s, and cl belongs to----period.

Answer 1

Si(silicon) , P(phosphorus), S(sulphur) and Cl (chlorine) belongs to 3rd period (p-block elements)

Silicon has an atomic number of 14
Phosphorus has an atomic number of 15
Sulphur has an atomic number of 16
and Chlorine has an atomic number of 17

I hope this will help you

Answer 2

Answer

Si, p, s, and cl belongs to the 3rd period.

Explanation:

Si is Silicon (and has atomic number 14)

P is phosphorus (and has atomic number 15)

S is Sulphur (and has atomic number 16)

And Cl is Chlorine (and has atomic number 17)

The 3rd period refers to all the elements that lie in the 3rd row of a periodic table, and here all the above 4 elements given in the question lies in the 3rd row of a periodic table, being the 3rd period.