Page 2 - 4. Home Assignment Ch-5 MENDELEEVES CLASSIFICATION

Subjective-
S.L Questions Ma Skill
No. rk
Q.1 1 R
What were the criteria used by Mendeleev in creating this periodic
table? [CBSE 2013]
Q.2 1 u
State Mendeleev’s periodic law. [CBSE 2012]
Q.3 3 R+
a. Why did Mendeleev leave gaps in his periodic A
table?
b. State any three limitations of Mendeleev’s periodic
table.
c. How do the electronic configuration of atoms change in a
period with increase in atomic number. [CBSE 2009]

Q.4 3 U+
What physical and chemical properties of elements A
were used by Mendeleev in creating his periodic table? List two
observations which posed a challenge to Mendeleev’s Periodic Law.
[CBSE 2009]

Q.5 5 HO
a. Why do we classify elements? T
b. What were the two criteria used by Mendeleev in creating his
periodic table.
c. Why did Mendeleev leave some gaps in his periodic table?
d. In Mendeleev’s periodic table, why was there no
mention of noble gases like He, Ne and Ar?
e. Would you place two isotopes of Cl-35 and Cl-37in different
slots because of their different atomic mass or in the same slot
because their chemical properties are same? Justify your answer.
[CBSE 2015, 2013, 2012]

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