Sunday, January 26, 2014

SCHOOL OF ELEMENTS

FILL IN THE BLANKS

MATCH THE COLUMN


DEFINE




GIVE SCIENTIFIC REASONS [Textual]

Atomic size increases down the group


Metallic character decreases from left to right in a period


Elements in the same group show the same valency




GIVE SCIENTIFIC REASONS [Non Textual]

Chlorine is placed in VII A group in the modern periodic table.

Metallic character decreases across a period.

Group VII A elements are strong non-metals and group I A elements are strong metals.

Non-metallic character increases across a period.

Atomic size decreases across a period.

The family of noble gases is called as zero group.

Valency varies gradually across a period.



ANSWER THE FOLLOWING


How could the modern periodic table remove various anomalies of Mendeleev's periodic table?


In modern periodic table, which are the metals, non metals and metalloids among the first 20 elements?


What are the demerits of Mendeleev's Periodic table?


Define atomic size. How does it vary in a period and in a group?


Name three elements


The atomic number of an element X is 17. Predict :