Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 16

1. Group 1B to 2B and 3B to 8B, situated at the centre of table constitute ________ block.




2. Group 3A to 7A and 0 group (except He), on right side of modern periodic table constitute ___ block.




3. How modern periodic table has been divided into blocks?
Short..Answer............................................... Group 1 A and 2 A = s block, Group 3A to 7A and zero = p block (except He) , all
group B= d block, lanthanides and actinides= ---------


4. If an element having atomic number 120 is discovered, where will it be placed in the periodic table? How many electrons will it have in its --------- shell? Short..Answer............................................................
The element having atomic number 120 will be placed in group 2A after Radium. It will be a radioactive element. It will be "S" block element. It will have 2 electrons in its outer most shell or 8s2 valence shall electronic configuration.


5. In any group the electron affinity decreases down the group


6. In Mendeleef table group of noble gases was called____.



7. In modern periodic table group eight and zero means one and the same thing.


8. In periods the atomic radius decreases from?




9. Melting and boiling points in group 1A gradually decrease from top to bottom.


10. Metals of group 1A react vigorously with water producing hydrogen.


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