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# Solutions 5. Periodic Classification of Elements - Text-book Questions | Class 10 Science - Toppers Study

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## Solutions 5. Periodic Classification of Elements - Text-book Questions | Class 10 Science - Toppers Study

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Chapter 5 Science class 10

### Text-book Questions class 10 Science Chapter 5. Periodic Classification of Elements

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## Solutions 5. Periodic Classification of Elements - Text-book Questions | Class 10 Science - Toppers Study

Text-book Questions

Page no. 81

Q1. Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

Q2. What were the limitations of Döbereiner’s classification?

Q3. What were the limitations of Newlands’ Law of Octaves?

Page no.  85

Q1.Use Mendeléev’s Periodic Table to predict the formulae for the oxides of the following elements:

K, C, AI, Si, Ba.

Q2. Besides gallium, which other elements have since been discovered that were left by Mendeléev in his Periodic Table? (any two)

Q3. What were the criteria used by Mendeléev in creating his Periodic Table?

Q4. Why do you think the noble gases are placed in a separate group?

Page no. 90

Q1. How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table?

Q2. Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?

Q3. Name

(a) three elements that have a single electron in their outermost shells.

(b) two elements that have two electrons in their outermost shells

(c) three elements with filled outermost shells.

Q4. (a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?

(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

Q5. In the Modern Periodic Table, which are the metals among the first ten elements?

Q6. By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?

Ga Ge As Se Be