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

Atomic number of actinium is:

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

Atomic size of Neon is ____________

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

Group-1 is also called:

Which element has high value of electro negativity ?

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

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

How many elements present in 7^th period?

Mark the incorrect statement about ionization energy:

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

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

The horizontal lines present in the periodic table are called ________

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

All transition elements are _________ .

Which element are present in group-1?

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

Electron affinity of fluorine in kjmil-1 is

Elements with atomic No 90 to 103 are called:

The unit of ionization energy is:

How many elements present in 1^st period?

Along the period, which one of the following decreases:

In which year Moseley described his periodic law?

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

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

Who are arranged the elements in groups of three

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

Unit of atomic size is _________

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

Unit of electron affinity is ___________

Actinide series is started from the elements:

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

Element with Atomic no 58 to 71 are called:

When we move from top to bottom ionization energy __________ .

Actinides are belonged to period:

The atomic radii of the elements in periodic table

The elements of a group show __________ properties:

How many periods are present in the modern periodic table?

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

Transition elements are:

The first ionization energy of sodium atom is ______

The elements or group 3 to 12 are called:

The vertical columns present in the periodic table are called __________

All transition elements are belonged to:

Period number tells about the:

Atomic size of lithium is ___________

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

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

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

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

How many elements present in 6^th period?

Which elements are present in 2^nd period

Lanthanides series is started from the elements:

Group number tells about the:

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

Atomic number of lanthanum is:

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

In which year Mendeleev described his periodic law?

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

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

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

Group-17 elements are known as:

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

Lanthanide is belonged to period:

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

Point out the incorrect statement about electron affinity

How many elements block present in modern periodic table?

Who were trying to convert inferior metals to superior metals?

Long form of periodic table is constructed on the bases of

How many groups are present in the modern periodic table?

Which elements are present in 1st Group

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

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

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

Elements of a period show properties?

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

Mendeleev’s periodic table was based upon the

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

Normal elements are belonged to: