Atomic radii . . . . . . . . . . . . . . . of periodic table . A ) increases from left to right and decreases from top to down , B ) decreases from left to right and increases from top to down , C ) increases from left to right and increases from top to down , D ) None of these ,

1 ) Atomic radii . . . . . . . . . . . . . . . of periodic table .

A ) increases from left to right and decreases from top to down ,

B )  decreases from left to right and increases from top to down ,

C )  increases from left to right and increases from top to down ,

D ) None of these ,

Correct Answer : -  B )  decreases from left to right and increases from top to down ,

 

2 ) Total . . . . . . . . . groups in modern periodic table .

A ) 14 ,                                                       B ) 18 ,

C ) 16                                                         D ) None of these ,

Correct Answer : -   B ) 18 ,

 

3 ) Difference in density is the basis of gravity separation .

 

4 ) The no. of electrons in valence shell of element reflects  . . . . . . . . . . . ,

A ) period number  ,                                                     B ) group number ,

C ) both of these ,                                                        D ) None of these ,

Correct Answer : -   B ) group number ,

 

5 ) In 5th period , there are . . . . . . . . . elements .

A ) 12 ,                                                       B ) 18 ,

C ) 16 ,                                                       D ) None of these ,

Correct Answer : -   B ) 18 ,

 

6 ) Ionization energy . . . . . . . . . . . . . of periodic table .

A ) increases from left to right and decreases from top to down ,

B )  decreases from left to right and increases from top to down ,

C )  increases from left to right and increases from top to down ,

D ) None of these ,

Correct Answer : -  A ) increases from left to right and decreases from top to down ,

Ionization energy : - The energy required to reduce / remove an electron from valence shell of an atom .

 

7 ) Electronegativity . . . . . . . . . . . . . . . periodic table .

A ) increases from left to right and decreases from top to down ,

B )  decreases from left to right and increases from top to down ,

C )  increases from left to right and increases from top to down ,

D ) None of these ,

Correct Answer : -  A ) increases from left to right and decreases from top to down ,

Electronegativity : - The force that attracts electron towards itself .

 

8 ) " 4F "  electronic  sub - shell in Lanthanides is incompletely filled .

 

9 ) Number of elements in 4th period is . . . . . . . . . . . . ,

A ) 14 ,                                                       B ) 18 ,

C ) 16                                                         D ) None of these ,

Correct Answer : -   B ) 18 ,

 

10 ) Metallic character . . . . . . . . . . . down the group .

A ) increases ,                                                    B ) decreases ,

C ) no change ,                                                  D ) None of these ,

Correct Answer : -   A ) increases ,

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