Suppose that 1 st and 2 nd group elements are represented by the symbols X and Y. Complete the given table. Group Valency Oxidation state Symbol of ions Chemical formula of oxides 1 st group X 1 + 1 - X 2 O 2 nd group Y 2 - Y 2 + -

Group Valency Oxidation state Symbol of ions Chemical formula of oxides 1 st group X 1 + 1 X 1 + X 2 O 2 nd group Y 2 + 2 Y 2 + YO The valency of group 1 element is 1 and the valency of oxygen is 2. So the formula of group 1 is X 2 O where X is the group 1 element and O is oxygen. The valency of group 2 element is 2 and the valency of oxygen is 2. So the formula of group 2 is YO where Y is the group 2 element and O is oxygen. The Group 2 elements are called alkaline earth metals.

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Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

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Write the sub-shell electronic configuration of iron and find the block to which it belongs to.

Important Questions on Periodic Table and Electronic Configuration

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Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

Write the sub-shell electronic configuration of argon and find the block to which it belongs to.

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Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise

What is the relation between the number of electrons present in the last ‘s’ sub-shell and their group number?

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Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

When the s block elements react, do they donate or accept electrons?

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Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

How many electrons are donated by the first group elements in chemical reactions?

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Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

How many electrons are donated by the second group elements in a chemical reaction?

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Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise>Q ●

Suppose that $1^{st}$ and $2^{nd}$ group elements are represented by the symbols X and Y. Complete the given table.

Group	Valency	Oxidation state	Symbol of ions	Chemical formula of oxides
$1^{st}$ group $[X]$	$1$	$+ 1$	-	$X_{2} O$
$2^{nd}$ group $[Y]$	$2$	-	$Y^{2 +}$	-

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Chemistry Standard X Part 1>Chapter 1 - Periodic Table and Electronic Configuration>Exercise

‘s’ block elements are present at the extreme left side of the periodic table. Relating to their position, what other characteristics can be listed out?