If an atom has electronic configuration 1s²2s²2p⁶3s²3p⁶3d³4s², we will place it in group number:

1.	Fifth	2.	Fifteenth
3.	Second	4.	Third

The correct order of $I^{st}$ IP(ionization potential) among the following elements Be, B, C, N, O is:

The basic theme of the periodic table is:

Property used by Mendeleev to classify the elements was -

1. Brightness

2. Atomic weight or mass

3. Number of isotopes

4. Lustre

The basic difference between Mendeleev’s Periodic Law (A) and Modern Periodic Law (B) is:

The number of elements in the 6th period of the periodic table is-

1. 32

2. 36

3. 35

4. 33

The period and group number of the element with Z =114 are:

The atomic number of the element present in the 3rd period and 17th group of the periodic table would be -

1. 18

2. 23

3. 24

4. 17

The similarity in physical and chemical properties in a group of periodic table is due to the -

1. Same atomic number

2. Same number of valence electrons.

3. Same atomic mass

4. Same number of isotopes

The ionic radius indicates the distance between the nucleus and :

1. outermost shell of an atom.

2. outermost shell of an ion.

3. outermost shell of the cation only.

4. outermost shell of the anion only.