Name: Need for Classifying Elements
Uploaded: 2019-07-19
Duration: 8 min 18 s
Description: We all like things that are properly arranged and placed. What about the arrangement of elements? On what basis can they be arranged? Let us explore.

Question

1	2	13	14	15	16	17	18
$Li$		D			O	J	$Ne$
A	$Mg$	E	$Si$		H	K
B	C		F	G			L

Some elements are given above in their own symbol and position in the periodic table while others are shown with a letter. With reference to the table:
(i) Which is the most electronegative?
(ii) How many valence electrons are present in G?
(iii) Write the formula of the compound between B and H.
(iv) In the compound between F and J. What type of bond will be formed?
(v) Draw the electron dot structure for the compound formed between C and K.

Accepted Answer

(i) J is the most electronegative element here. This is because it belongs to group 17. In a periodic table, electronegativity increases from left to right.

(ii) The electronic configuration of G is $2, 8, 18, 5$ . Therefore, in G five valence electrons are present in the outermost shell.

(iii) The formula of the compound between B and H is $B_{2} H$ . The valency of H is two and B is one.

(iv) Covalent bond will be formed in the compound between F and J. It will be formed by sharing of electrons.

(v) The electron dot structure for the compound formed between C and K can be shown as,

Important Questions on Periodic Classification of Elements

Learn and Prepare for any exam you want !

Group/Periods	1	2	3 to 12	13	14	15	16	17	18
2	A					B			C
3		D			E				F