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Which of the following sets represents a collection of isoelectronic species? (Atomic numbers are: Caesium = 55, Bromine = 35)

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Important Questions on Classification of Elements and Periodicity in Properties

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The maximum number of electrons that can be filled in the shell with the principal quantum number n=4 is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The element which readily forms an ionic bond has the electronic configuration
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
Which statement is incorrect for the periodic classification of elements?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
Aqueous solution of which of the following salts will not contain ions with the electronic configuration 1s22s22p63s23p6 ?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
If the principal quantum number n=6, the correct sequence of filling of electrons will be:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
Which one of the following statements is wrong?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
Gd64 has __ unpaired electrons with sum of its spin as  __.
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The number of unpaired electrons in Ni2+ (atomic number =28 ) are
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The number of d-electrons in Fe2+ (Z=26) is not equal to the number of electrons in which one of the following?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
How many electrons can fit in each orbital for which n=3 and l=1?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The total number of orbitals associated with the principal quantum number 5 is:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The element with Z=120 (not yet discovered) will be a/an
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The electronic configuration which obeys Hund's rule for the ground state of carbon atom is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
Energy associated with the first orbit of He+ is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The orbital nearest to the nucleus is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
The number of valence electrons in an atom with electronic configuration 1s22s22p63s23p3 is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?

(At. No. Z = 22)
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronic Configurations and Types of Elements
Scandium is a transition element. But zinc is not. Why?