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Classification of Elements and Periodicity in Properties · Question 38

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

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)

AIPMT 2003

Keep practising — Classification of Elements and Periodicity in Properties

2

Which of the following is isoelectronic?

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

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
AIPMT 2002
4

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
AIPMT 2002
5

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
AIPMT 2001

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