Question

list these elements in order of increasing ionization energy. p, si, cl, s

Explanation:

Step1: Recall ionization - energy trend

Ionization energy generally increases across a period from left - to - right due to increasing nuclear charge and decreasing atomic radius. P, Si, Cl, and S are in the third period.

Step2: Identify atomic numbers

Si has atomic number 14, P has atomic number 15, S has atomic number 16, and Cl has atomic number 17.

Step3: Order the elements

Based on the trend, the order of increasing ionization energy is Si < P < S < Cl.

Answer:

Si, P, S, Cl