Unit III Classification of elements and Periodicity in properties

Q1. The electronic configuration of an ion M³⁺generated from an element with atomic number 58 is:

 [Xe] 4f¹ 5d¹ 6s²
 [Xe] 4f¹
 [Rn] 5f³ 6d¹ 7s²
 [Rn] 5f²


Q2. Which one of the following blocks of elements is called Representative elements?

 s-block elements only
 f-block elements only
 d-block elements only
 p-block elements together with s-block elements


Q3. Who among the following scientist developed the modern periodic table?

 Henry Mosley
 Dmitri Ivanovich Mendeleev
 John Alexander Newlands
 Johann Dobereiner


Q4. Which one among the following elements has the most negative electron gain enthalpy?

 F
 Cl
 P
 S


Q5. Which one of the following groups of elements contains true metals only?

 Carbon, Boron, Silicon
 Magnesium, Aluminium, Selenium
 Boron, Carbon, Nitrogen
 Sodium, Thallium, Bismuth


Q6. The physical and chemical properties of elements are periodic functions of their

 Atomic weight
 Atomic size
 Atomic number
 Atomic shape


Q7. Consider the following statements:
        1. Sulfur has a higher ionization energy than phosphorus
        2. Sulfur has a lower ionization energy than phosphorus
        3. Sulfur has a lower electron affinity than chlorine
Which of the statements given above is/are correct?

 1 only
 2 only
 1 and 3 only
 2 and 3 only


Q8. Consider the following statements:
      1. On moving from left to right in the periodic table, the metallic character of elements decreases
      2. On moving from left to right in the periodic table, the oxides of elements become less basic
Which of the statements given above is/are correct?

 1 only
 2 only
  Neither 1 nor 2
  Both 1 and 2


Q9. Which one of the following represents the correct order of electron gain enthalpy (electron affinity) among F, Cl, Br and I?

 Cl > F > Br > I
 F > Cl > Br > I
  I > Br > Cl > F
  I > Br > F > Cl


Q10. Which of the following factors affect the ionization energy?
      1. Atomic size
      2. Nuclear charge
      3. Type of electrons involved
Select the correct answer using the code given below.

 1 and 2 only
 1 and 3 only
 2 and 3 only
 1, 2 and 3