Name: Electronic Configuration of Elements
Uploaded: 2019-07-19
Duration: 6 min 6 s
Description: The number of protons in an atom is called its atomic number, represented by ‘Z’, while the sum of its protons and neutrons is called its mass number, given...

Question

Complete the table given below and answer the following questions (symbols used are not true).

Element	Atomic number	Electronic configuration
$P$	$9$	$2, 7$
$Q$	$17$	_____
$R$	$10$	_____
$S$	$12$	_____

a) Which element in the table is the most stable one? Justify your answer.
b) Which element donates electrons in a chemical reaction?
c) Write the chemical formula of the compound formed by combining element $S$ with $P$ .

Accepted Answer

Electronic configuration is the distribution of electrons in different shells of an atom. Therefore, the given table can be completed as,

Element Atomic number Electronic configuration

$P$ $9$ $2, 7$

$Q$ $17$ $2, 8, 7$

$S$ $12$ $2, 8$

$S$ $12$ $2, 8, 2$

a) From the above table, it is clear that, the element $R$ has completely filled outermost shell. Therefore, it will be the most stable one.

b) The element $S$ donates electrons in a chemical reaction. This is because, it has two electrons in its outermost shell which can be lost easily. The elements $P$ and $Q$ accepts electrons as they have seven electrons in their outermost shell. The element $R$ will be an inert gas as it has completely filled outermost shell.

c) The valency of the element $S$ here is two as it has two valence electrons. Similarly, the element $P$ has a valency of one as it needs one more electron to attain stability. Therefore, we can give the chemical formula of he compound formed by interchanging the valencies of $S$ and $P$ . That is, the chemical formula will be ${SP}_{2}$ .

Elements	Valency
$Ba Cl$	$2 1$

Elements	Valency
$Zn O$	$2 2$

Kerala Board Solutions for Chapter: Chemical Bonding, Exercise 2: Let us assess

Kerala Board Chemistry Solutions for Exercise - Kerala Board Solutions for Chapter: Chemical Bonding, Exercise 2: Let us assess

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