In the periodic table going down in Fluorine group
Which of the following statement is not correct regarding hydrogen atom
Which of the following pairs has both members from the same period of the periodic table
The elements with atomic number 10,18,36,54, and 86 are all
The elements having the electronic configuration, [Kr]
Which of the following elements are analogous to the lanthanides
The most important active step in the development of periodic table was taken by
On moving from left to right across a period in the table the metallic character
The tenth elements in the periodic table resembles with the
Element of atomic number 6 is placed in
The number of d - electrons in Fe2+ (Z=26) is not equal to the number of electrons in which one of the following
An element with atomic number 21 is a
The element with atomic number 36 belongs to______block in the periodic table.
Beryllium shows diagonal relationship with
Differentiating electron in inner transition elements enters the_____ orbital.
Smallest among these species is
Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S,..
Which of the following element is metalloid?
The electronic configuration of an element is (1s)^2 (2s)^2 (2p)^6 (3s)^2 (3p)^3. What is the atomic number of the element, which ..
Which of the following is not a periodic property?
The formation of the oxide ion (O)^-2(g), from oxygen atom requires first an exothermic, and then an endothermic step as shown bel..
The electronic configuration (1s)^2, (2s)^2, (2p)^6, (3s)^2, (3p)^6, (3d)^9 represents a
In the periodic table metals usually used as catalyst belong to
Which pair has both members from the same period of periodic table?
If the atomic number of an element is 33, It will be placed in the periodic table in the
The electron affinity of Be is almost similar to that of
Number of elements presents in the fifth period of periodic table is
The element Z=114 has been discovered recently. It will belong to which of the following family/group and electronic configuration..
Which of the following electronic configuration represents noble gas?
The only non-metal which is liquid at ordinary temperature is
Which among the following has the highest ionisation potential?
Which of the following have the largest ionic size?
The species Ar, K+ and (Ca)^2+ contain the same number of electrons. In which order do their radii increase?
The strongest base of the following is
Ionisation energy and election affinity are defined at
The first ionisation of na is 5.1 eV. The value of electron gain enthalpy of Na+ will be
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