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What is the number of elements in the 3rd period of the modern periodic table?

Important Questions on The Periodic Table

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9th ICSE
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Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 7

How does the number of (i) valence electrons (ii) valency vary on moving from left to right in the second period of the periodic table?

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9th ICSE
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Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 7

How does the number of (i) valence electrons (ii) valency vary on moving from left to right in the third period of the periodic table?

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Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 8
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving from left to right?
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Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 9

This question refers to the elements of the periodic table with atomic numbers 3 to 18. Some of the elements are shown by letters but the letters are not the usual symbols of the elements.

3 4 5 6 7 8 9 10
A B C D E F G H
11 12 13 14 15 16 17 18
I J K L M N O P

 If A combines with F, what would be the formula of the resulting compound?

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9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 9

This question refers to the elements of the periodic table with atomic numbers 3 to 18. Some of the elements are shown by letters but the letters are not the usual symbols of the elements.

3 4 5 6 7 8 9 10
A B C D E F G H
11 12 13 14 15 16 17 18
I J K L M N O P

 What is the electronic configuration of G ?

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9th ICSE
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Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 10
Sodium and aluminium have atomic numbers 11 and 13 respectively. They are separated by one element in the periodic table and have valencies 1 and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table. Their atomic numbers are 17 and 19 respectively, but both have a valency of 1. Explain why
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9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 11
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
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Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 12
In which part of a group would you separately expect the elements to have the greatest metallic character?