Page 2 - 4. Home Assignment Ch-5 MODERN PERIODIC TABLE

Subjective-

S.L Questions Ma Skill
No. rk

Q.1 1 R
Write the number of horizontal rows in the modern
periodic table. What are these rows called? [CBSE 2014]

Q.2 Write one difference between Group 1 and Group 2[CBSE-2014] 1 u
elements?

Q.3 An element X belongs to 3rd period and group 16 of the Modern 3 R+
Periodic table. A
a. Determine the number of valence electrons and
the valency of X.
b. Molecular formula of the compound of X when it
reacts with hydrogen and write its electron dot
diagram.
c. Name the element X and state whether it is
metallic or non-metallic. [ CBSE -2015]

Q.4 3 U+
What is periodicity in properties of elements with
reference to the Modern Periodic Table? Why do all the elements of A
the same group have similar properties? How does the tendency of
elements to gain electrons change as we move from left in a
period? State the reason of this change. [CBSE -2017]

Q.5 An element is placed in the 2nd Group and 3rd Period of the Periodic 5 HO
T
Table. It burns in presence of oxygen to form a basic oxide.

(a) Identify the element
(b) Write the electronic configuration
(c) Write the balanced equation when it burns in the
presence of air

(d) Write a balanced equation when this oxide is dissolved
in water

(e) Draw the electron dot structure for the formation of this
oxide

----------------------------------------------------------------------------------------------------------------

2