Which of the element is most metallic in group I and why?

Important Questions on Periodic Classification of Elements

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 7

Which of the element is most non-metallic in group 16 and why?

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 8

In its modified form_____is an organisation of all the known elements, arranged in order of increasing_____of the element lie in the same_____have similar_____, have the same number of_____. The table is particularly useful for predicting the outcome of chemical reactions between_____since an atom of any element tends to react so as to convert its electronic structure to that of a nearby_____.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 9

Looking at the resemblance to alkali metals and the halogen family, try to assign hydrogen a correct position in Mendeleev's periodic table. To which group and period hydrogen can be assigned.

EASY

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 10

Name the first 3 elements of first group of modern periodic table. Write their electronic configuration.

HARD

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 11

Describe the achievements of Mendeleev's periodic table.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 12

What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations which passed a challenge to Mendeleev's periodic law.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 13

Table given below shows a part of the periodic table

H							He
Li	Be	B	C	N	O	F	Ne
Na	Mg	Al	Si	P	S	Cl	Ar

Using this table to explain why?
(a) Li and Na are considered as active metals.
(b) Atomic size of Mg is less than that of Na.
(c) Fluorine is more reactive than chlorine

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 14

The position of three elements A, B and C in the periodic table are shown below :

Group VI	Group VII
-	-
-	A
-	-
B	C

Giving reasons, explain the following:
(a) Element A is a non-metal.
(b) Element B has a larger atomic size than element C.
(c) Element C has a valency of $1$.