Classification ...

f block of the Periodic Table consists of

The elements charecterised by the filling of 4 f-orbitals, are:

14 elements after actinium is called

An element belongs to Group 15 and third period of the periodic table. Its electronic configuration will be

It is now recognized that the ‘Modern Periodic Law’ is essentially the consequence of the

Metalloids show the properties of

One of the following options is not used for explaining atomic radius

Among the alkali metals cesium is the most reactive because

In which one of the given formulae of xenon compounds there are five α−bonds and three π-bonds in it?

In the modern periodic table

Which of the following statements is false?

The order of Decreasing radius is

For alkali metals, which one of the following trends is INCORRECT?

Dmitri Mendeleev (1834-1907) and the German chemist, Lothar Meyer (1830-1895) proposed arranging elements in

According to the recommendation of International Union of Pure and Applied Chemistry (IUPAC), the groups in the modern periodic table are numbered from

Ionization enthalpy increases across a period because

Choose one of the following in th increasing order of bond length

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order? (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

A transition metal ion exists in its highest oxidation state. It is expected to behave as

The sequence of ionic mobility in aqueous solution is 

In the periodic table Electronegativity generally

Al(3+)

Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is ______.

Which of the following will have the most negative electron gain enthalpy and which one the least negative? P, S, Cl, F.

For Atomic numbers greater than 100 IUPAC has made recommendation that until a new element ‘s discovery is proved, and its name is officially recognized, a systematic nomenclature be derived directly from the atomic number of the element using the numerical roots for 0 and numbers 1-9. The name 'sept' in this scheme corresponds to the digit