Chapter 3-5 Student Chemistry Worksheet - Class X, Central Board Of Secondary Education Page 29
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30Formative Assessment Manual for Teachers
Period Classification of Elements - Chapter 5
Period Classification of Elements
Chapter 5
Assesment Technique: Data Based Worksheet
Objectives: To enable the students to -
●
Learn the salient features of the Modern Periodic table.
●
Understand the trends of different properties on the periodic table.
Task:
Individual
Procedure:
●
This worksheet may be given to the students after recalling the salient features of the
periodic table using a chart displaying Modern Periodic Table.
●
The valence electrons change across a period but remains same in the groups and so
the valency.
●
Atomic size decreases across a period but increases down the group.
●
Metallic character decreases across a period but increases down the group.
●
Non metallic character increases across a period but decreases down the group.
Assessment Parameter
½ mark for each correct answer
Student Worksheet
Read the following lines written about the Modern Periodic Table and fill in the blanks
I am the Modern Periodic Table, where elements are arranged on the basis of ______________.
I have ______________ Horizontal rows called______________ and ____________
vertical columns are called ______________. My first period is very short with __________
elements and 2 and 3 Period contain ____________elements, 4 and 5 has____________
elements. 6 period has____________elements but 7 period is____________. With space
for more elements. 17 group is of____________ 18 is of____________. Atomic size of
my elements____________ across the period but____________ down the group same as
the metallic character but the non metallic character is____________to that Number of
valence electrons ____________across the period so varies the valency but valency of the
elements is ____________in a group. All the properties of elements are the Periodic fuction
of ____________.
59
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