Periodic classification

 

1. Who gave the law of triads?

2. Law of octaves was given by         ...........-

3. Mendeleev Periodic Law                 was............

4. A plot of --- vs atomic number gave a straight line.

5. The elements with atomic no 117 and 119 will be named as - (NEET)

6. The compounds of s block with the exception of ___ and. are predominantly ionic. --

7. Reactivity always decrease down the group. T/F

8. In case of alkali metals, reactivity increase/decrease down the group.

9. In case of halogens, reactivity increase/decrease down the group.

10. First IE, trend of the elements of 2nd period is - (NEET)

11. Across the period, increasing shielding outweighs nuclear charge. T/F

12. ...........assigned an arbitrary electronegativity value of................ to F.

13. The electronegativity of any given element is not constant. T/F 

14. Electronegativity varies depending on the element it is bound. T/F

15. Electronegativity decreases from left to right. T/F

16. The anomalous behavior of the second period element is attributed to - (3) 

17. The chemical reactivity of an element can be best shown by its reaction with ‒‒‒‒‒ and _-‒‒‒

18. Amphoteric oxides ex - (2) (NEET)

19. Neutral oxides ex - (3) (NEET)