Along the period, which one of the following decreases:

How many elements present in 1^st period?

Which one of the following halogens has lowest electron-egativity?

How many elements present in 6^th period?

Who were trying to convert inferior metals to superior metals?

Elements with atomic No 90 to 103 are called:

The ability of an atom to attract the shared pair of electrons toward, itself in a molecule is called:

Elements of group 1 & 2 have their valence electrons in sub shell.

Point out the incorrect statement about electron affinity

In Periodic Table, 2^nd & 3^rd period are called _______

How many elements block present in modern periodic table?

Elements of group 13 to 18 have their valence electrons in sub shell.

Which element has high value of electro negativity ?

The distance between the Nuclei of two carbon atoms in its elements form is ___________

How many elements present in 7^th period?

Which element are present in group-1?

Group-17 elements are known as:

Which period of the modern periodic table is considered as incomplete period

All transition elements are _________ .

Elements of a period show properties?

Atomic size of lithium is ___________

How many groups are present in the modern periodic table?

4^th and 5^th period of the long form of periodic table are called

Atomic number of actinium is:

Actinides are belonged to period:

When we move from left to right in a period ionization energy is ___________.

Atomic number of lanthanum is:

Mark the incorrect statement about ionization energy:

How many elements were present in Mendeleev’s periodic table?

Groups-17 elements contains electrons in their outer most shell:

Mendeleev arranged elements in his periodic table on the basis of:

How many electrons present in the valence shell of group-1 elements?

In which year Newland put forward his observation I the form of law of octaves?

Group-1 is also called:

When we move left to right in a period atomic number _________

Mendeleev’s periodic table was based upon the

How many periods are present in the modern periodic table?

Period number tells about the:

The vertical columns present in the periodic table are called __________

All transition elements are belonged to:

Who are arranged the elements in groups of three

Elements are classified into four blocks depending upon the type of the

When we move from left to right in a period shielding effect is ___________

Transition elements are:

Which elements are present in 2^nd period

When we move from top to bottom in a group atomic size is __________.

Lanthanides series is started from the elements:

Normal elements are belonged to:

The amount of energy released when an electron is added in the outermost shell of an isolated gaseous atom is called

Actinide series is started from the elements:

The amount of energy given out when an electron is added to an atom is called ____________

When we move from top to bottom in a group shielding effect is ____________.

Atomic size of Neon is ____________

The atomic radii of the elements in periodic table

How many elements present in 4^th & 5^th Period?

Group number tells about the:

Electron affinity of fluorine in kjmil-1 is

Unit of electron affinity is ___________

In modern periodic table the elements in a group do not have continuously increasing

With increase atomic number, the number of electrons in an atom also ______

The unit of ionization energy is:

The horizontal lines present in the periodic table are called ________

The minimum amount o energy which is required to remove an electron from the gaseous state of an atom is called

The elements of a group show __________ properties:

Long form of periodic table is constructed on the bases of

Lanthanide is belonged to period:

When we move from top to bottom ionization energy __________ .

When we move from left to right in a period atomic size is _____________

Moseley arranged the elements in his periodic table on the basis of:

How many elements present in 2^nd & 3^rd Period?

In which century chemists devoted to arrange the elements in a systematic manner:

Element with Atomic no 58 to 71 are called:

The group-1 and group-2 and group-13 to group-17 contain the elements:

The first ionization energy of sodium atom is ______

In which year Mendeleev described his periodic law?

1. Who determined the correct atomic masses of elements in 1860?

The elements or group 3 to 12 are called:

Which elements are present in 1st Group

Unit of atomic size is _________

In which year Moseley described his periodic law?