Chapter 3-5 Student Chemistry Worksheet - Class X, Central Board Of Secondary Education Page 30
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30Chapter 5 - Period Classification of Elements
Formative Assessment Manual for Teachers
Suggested Remediation:
●
A few students may not recollect the salient features of the modern periodic table.
●
the table can be displayed for the help.
●
A few students may not recall the trend in different properties.
●
Teacher may explain the same again.
●
Teacher may suggest the students to learn the Poem.
Period Classification of Elements
Class 5
Assesiytent Technique: Diagram/ (Periodic Table) Based Worksheet
Objectives: To enable the students to -
●
Appreciate the periodic trends in properties of elements.
●
Learn salient features of new periodic table.
●
Study and analyse the given table for the placement and properties of elements in the
Modern Periodic Table.
Task:
Individual
Procedure:
The teacher, may give the following worksheet after the teaching-learning about the modern
periodic table. The following information may be recalled with the students before they start
working on the worksheet:
●
Elements of 1st group are called alkali metals,
●
2nd group elements are called alkaline Earth metals,
●
Elements of group 17 are called Halogens and that of group 18, are called
noblegases.
●
Atomic number of elements increases from left to right in the period and top to bottom
in the group in periodic table.,
●
Valency (the combining capacity) of an element can be .determined by-
1.
The number of,valence electrons if the number is equal to or less than 4.
2.
(8 - Valence electrons) if the number of valence electrons is more than 4.
3.
The group number for elements of group 1 and 2.
60
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