The atomic radius of main-group elements generally increases down a group becaus

Question

The atomic radius of main-group elements generally increases down a group because . effective nuclear charge decreases down a group. the principal quantum number of the valence orbitals increases. O effective nuclear charge increases down a group. effective nuclear charge zigzags down a group. Of the choices below, which gives the correct order of decreasing first ionization energies ? Cl > S > AI > Ar > Si AI > Si > S > Cl > Ar Cl > Si > Ar > Al > S Ar > Cl > S > Si > Al S > Si > Cl > Al > Ar

Explanation / Answer

Q.1: As we move down the group one new shell is added. Hence the principal quantum number of the valancy orbitals increases. Hence atomic radius increases down the group. Hence second option is correct.

Q.2: As we move from left to right in a period the atomic radius decreases and the force of attraction between the nucleus and valance electron increases and more energy is required to remove an electron. Hence Ionization energy increases as we move from left to right in a period. Ar has the highest ionization energy due to fulfilled electron configuration followed by Cl, S, Si Al.

Hence the order is

Ar > Cl > S > Si > Al

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.