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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?

Important Questions on 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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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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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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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?

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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 largest atomic size?

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Concise Chemistry Class 9>Chapter 5 - The Periodic Table>EXERCISE 5(B)>Q 13

What happens to a number of valence electrons in atoms of elements as we go down a group of the periodic table?

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?

Important Questions on The Periodic Table

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