AIEEE 2004 | Structure of Atom Question 165 | Chemistry

Which one of the following sets of ions represents the collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

K⁺, Cl^-, Mg²⁺, Sc³⁺

Na⁺, Ca²⁺, Sc³⁺, F^-

K⁺, Ca²⁺, Sc³⁺, Cl^-

Na⁺, Mg²⁺, Al³⁺, Cl^-

AIEEE 2003

MCQ (Single Correct Answer)

-1

The orbital angular momentum for an electron revolving in an orbit is given by $$\sqrt {l(l + 1)} {h \over {2\pi }}$$. This momentum for an s-electron will be given by

zero

$${h \over {2\pi }}$$

$$\sqrt 2 {h \over {2\pi }}$$

$$ + {1 \over 2}{h \over {2\pi }}$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

Which one of the following groupings represents a collection of isoelectronic species? (At. nos. : Cs : 55, Br : 35)

N^3-, F^-, Na⁺

Be, Al³⁺, Cl^-

Ca²⁺, Cs⁺, Br

Na⁺, Ca²⁺, Mg²⁺

AIEEE 2003

MCQ (Single Correct Answer)

-1

In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen

5 $$\to$$ 2

4 $$\to$$ 1

2 $$\to$$ 5

3 $$\to$$ 2

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