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Classification of Elements and Periodicity in Properties

AIPMT 2003MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2003

The ions O2-, F-, Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show

  1. a significant increase from O2- to Al3+
  2. a significant decrease from O2- to Al3+
  3. an increase from O2- to F- and then decrease from Na+ to Al3+
  4. a decrease from O2- to F- and then increase from Na+ to Al3+

Answer

(2) a significant decrease from O2- to Al3+

Solution

All five ions have 10 electrons, while the nuclear charge increases: O (8) < F (9) < Na (11) < Mg (12) < Al (13).

As per NCERT, in isoelectronic species the greater the nuclear charge, the greater the attraction for the electrons and the smaller the ion.

∴ O2- (140 pm) > F- (133 pm) > Na+ (102 pm) > Mg2+ (72 pm) > Al3+ (54 pm)

∴ The ionic radii show a significant decrease from O2- to Al3+.

Answer: (2)

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Ques. 2AIPMT 2002

Which of the following is isoelectronic?

  1. CO2, NO2
  2. NO2-, CO2
  3. CN-, CO
  4. SO2, CO2
Ques. 3AIPMT 2002

Which of the following order is wrong?

  1. NH3 < PH3 < AsH3 – acidic
  2. Li < Be < B < C – 1st IP
  3. Al2O3 < MgO < Na2O < K2O – basic
  4. Li+ < Na+ < K+ < Cs+ – ionic radius
Ques. 4AIPMT 2002

An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2, you will place it in which group?

  1. fifth
  2. fifteenth
  3. second
  4. third
Ques. 5AIPMT 2001

Correct order of 1st ionization potential among following elements Be, B, C, N, O is

  1. B < Be < C < O < N
  2. B < Be < C < N < O
  3. Be < B < C < N < O
  4. Be < B < C < O < N

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