In the following diagram for the first three periods of the periodic table- five elements have been represented by the letters a- b- c- d and e which are not their chemical symbols-e-i Select the letter which represents a halo-ii Select the letter which represents a noble gas-iii What type of bond is formed between a and b -iv What type of bond is formed between c and b -v Which element form a divalent anion- Give reasons for your choices-

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Groups in Modern Periodic Table

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Question

In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols):

(i) Select the letter which represents a halogen.
(ii) Select the letter which represents a noble gas.
(iii) What type of bond is formed between a and b?
(iv) What type of bond is formed between c and b?
(v) Which element form a divalent anion?
Give reasons for your choices.

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Solution

(i) The letter "b" represents halogen as "b" belongs to 17 group where valence electrons are 7.

(ii) The letter "e" represents noble gas as "e" belongs to 18 group where valence electrons are 8 and their octet is full.

(iii) Electronic configuration of a is 2, 8, 4
Electronic configuration of "b" is 2, 8, 7.
Elements "a" and "b" will form a bond by sharing of the electron, so a covalent bond will be form between them.

(iv) Electronic configuration of a is 2, 8, 2.
Electronic configuration of "b" is 2, 8, 7.
Elements "c" and "b" will form a bond by transfer of electrons and thus will form an ionic bond.

(v) The letter "d" will form a divalent anion.
Electronic configuration of d will be 2,8,6. It has 6 valence electrons in its outermost shell, so it will gain 2 electrons and become a divalent anion.

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The following diagram shows a part of the periodic table containing first three periods in which five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols) :

(i) Select the letter which represents an alkali metal.

(ii) Select the letter which represents a noble gas.

(iii) Select the letter which represents a halogen.

(iv) What type of bond is formed between a and e?

(v) What type of bond is formed between d and e?

Q. The following diagram shows a part of the periodic table containing first three periods in which five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols):

a	2	13	14	15	16	17
		b					c
d						e

(i) Select the letter which represents an alkali metal.
(ii) Select the letter which represents a nobles gas.
(iii) Select the letter which represents a halogen.
(iv) What type of bond is formed between a and e?
(v) What type of bond is formed between d and e?

Q. The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here are not the chemical symbols of the elements):

a 3	b 4		c 5	d 6	e 7	f 8	g 9	h 10
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(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
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Q. (a) What were the two major shortcomings of Mendeleev's periodic table? How have these been removed in the modern periodic table?
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Q. The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):

a 3	b 4		c 5	d 6	e 7	f 8	g 9	h 10
i 11	j 12		k 13	l 14	m 15	n 16	o 17	p 18

(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic i or k?
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(v) Select a latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.

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