Periodic Table & Periodicity

The electronegativity of aluminium is similar to :

For Na+, Mg2+, F- and O2-; the correct order of increasing ionic radii is :

The correct order of electron affinity is :

Which one of the following is an oxide?

The electronic configuration with the highest ionization enthalpy is :

Consider the following ionization enthalpies of two elements 'A' and 'B' .

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The following statements concern elements in the periodic table. Which of the following is true ?

The ionic radii (in Å) of N3–, O2– and F– are respectively:

The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+
will be:

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se
and Ar?

The increasing order of the ionic radii of the given isoelectronic species is :

Which one of the following order represents the correct sequence of the increasing basic nature of the
given oxides ?

Outer electronic configuration of Gd (Atomic no : 64) is -

The correct sequence which shows decreasing order of the ionic radii of the elements is

The set representing the correct order of ionic radius is :

In which of the following arrangements, the sequence is not strictly according to the property written against it

The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is :

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the
halogens are given. Which of these statements gives the correct picture?

Which of the following oxides is amphoteric in character?

In which of the following arrangements the order is NOT according to the property
indicated against it?

The formation of the oxide ion O2-(g) requires first an exothermic and then an endothermic
step as shown below
O(g) + e- = \(O_{(g)}^{-}\) \(\Delta\)Ho = -142 kJmol-1
\(O_{(g)}^{-}\) + e- = \(O_{(g)}^{2-}\) \(\Delta\)Ho = 844 kJmol-1
T...

Which one of the following ions has the highest value of ionic radius?

Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is

According to the Periodic Law of elements, the variation in properties of elements is related to their

The atomic numbers of Vanadium (V), Chromium (cr), Manganese (Mn) and Iron (Fe), respectively, \(23,24,25\) and \(26\). Which one of these may be expected to have the higher second ionization enthalpy?

The reduction in atomic size with increase in atomic number is a characteristic of elements of

Which one of the following is an amphoteric oxide?

The correct order of ionic radius is

\(C{e^{ + 3}},\,\,L{a^{ + 3}},\,\,P{m^{ + 3}}\,\,\) and \(Y{b^{ + 3}}\,\,\) have ionic radial in the increasing order as