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 pairs has both members from the same period of the periodic table
Differentiating electron in inner transition elements enters the_____ orbital.
Aluminium is diagonally related to (in periodic table)
If an atom has electronic configuration
Which of the following is the atomic number of a metal
The element with configuration
who is called the father of chemistry
Element of atomic number 6 is placed in
The elements having the electronic configuration, [Kr]
The long form of periodic table has
Which of the following is metalloid
The tenth elements in the periodic table resembles with the
The formation of the oxide ion (O)^-2(g), from oxygen atom requires first an exothermic, and then an endothermic step as shown bel..
In the periodic table going down in Fluorine group
Which of the following elements are analogous to the lanthanides
the first ionization potential of Na is 5.1 ev. the value of electron
Beryllium shows diagonal relationship with
The most important active step in the development of periodic table was taken by
Which of the following statement is not correct regarding hydrogen atom
The elements with atomic number 10,18,36,54, and 86 are all
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 ..
The electronic configuration (1s)^2, (2s)^2, (2p)^6, (3s)^2, (3p)^6, (3d)^9 represents a
the charge/size ratio of a cation determines its polarizing power
Smallest among these species is
On moving from left to right across a period in the table the metallic character
beryllium and aluminium exhibit many properties which are similar.
Which pair has both members from the same period of periodic table?
Which of the following element is metalloid?
Which of the following is not a periodic property?
An element with atomic number 21 is a
The number of d - electrons in Fe2+ (Z=26) is not equal to the number of electrons in which one of the following
The only non-metal which is liquid at ordinary temperature is
the ionic radii (in A) of N^3 - O^2 - and f- are respectively
In the periodic table metals usually used as catalyst belong to
Ionisation energy and election affinity are defined at
Which of the following have the largest ionic size?
Which among the following has the highest ionisation potential?
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