f block of the Periodic Table consists of

The first two groups of the periodic table

halogens (Group 17) and the chalcogens (Group 16)

Groups 13 and 14 “Transition Elements”.

The two rows of elements at the bottom of the Periodic Table, called the Lanthanides, Ce(Z = 58) ñ Lu(Z = 71) and Actinoids

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

periodic variation in electronic configurations

periodic variations in the element lattice

periodic variation in chemical bonds

periodic variation in chemical properties

Metalloids show the properties of

properties that are characteristic of both metals and viscous liquids

properties that are characteristic of both metals and plastics

properties that are characteristic of both metals and nonmetals

properties that are characteristic of both metals and gases

Among the alkali metals cesium is the most reactive because

it has a single electron in the valence shell

the outermost electron is more loosely bound than the outermost electron of the other alkali metals

it is the heaviest alkali metal

its incomplete shell is nearest to the nucleus

In the modern periodic table

The horizontal rows are called series and the vertical columns, groups.

The horizontal rows are called periods and the vertical columns, groups.

The horizontal rows are called groups and the vertical columns, periods

The horizontal rows are called periods and the vertical columns, series.

Which of the following statements is false?

Alkali metals form covalent bonds with oxygen.

Alkali metals have relatively low first ionization energies

Alkali metals forms oxides that act as basic anhydrides.

Alkali metals usually have a +1 oxidation state

The order of Decreasing radius is

Van der Waals’radius > Metallic radius > Covalent radius

Covalent radius > Van der Waals’radius

Metallic radius > Van der Waals’radius > Covalent radius

Van der Waals’radius > Covalent radius > Metallic radius

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

Hydration energy: Li > Na > K > Rb

Ionization energy: Li > Na > K > Rb

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

increasing order of their atomic weights

Decreasing order of their atomic masses

Decreasing order of their atomic numbers

increasing order of their atomic mass

Ionization enthalpy increases across a period because

outermost electrons are held more and more tightly

outermost electrons are not held tightly

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

a central metal in a coordination compound

In the periodic table Electronegativity generally

increases across a period from left to right and increases down a group

increases across a period from left to right and decreases down a group

decreases across a period from left to right and increases down a group

decreases across a period from left to right and decreases down a group

Al(3+)<Mg(2+)<Na+<F−<O(2−)<N(3−) The above can be aptly described as

the same number of electrons (9 electrons).

the same number of electrons (8 electrons).

the same number of electrons (7 electrons).

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