any twenty elements and their atomic number, valency , symbol

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Solution

Following are the name, symbol, atomic number and valency of few elements :

Name Symbol Atomic number Valenc1y
Hydrogen H 1 1
Helium He 2 0
Lithium Li 3 1
Beryllium Be 4 2
Carbon C 6 4
Nitrogen N 7 3
Oxygen O 8 2
Fluorine F 9 1
Neon Ne 10 0
Sodium Na 11 1
Magnesium Mg 12 2
Aluminium Al 13 3
Silicon Si 14 4
Iron Fe 26 2, 3
Zinc Zn 30 2
Chlorine Cl 17 1
Argon Ar 18 0
Potassium K 19 1
Calcium Ca 20 2
Bromine Br 35 1

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Q. An element with atomic number

17

is placed in the group

17

of the long form periodic table. Element with atomic number

9

is placed above and with atomic number

35

is placed below it. Element with atomic number

16

is placed left and with atomic number

18

is placed right to it. Which of the following statements are correct:
(i) Valency of the element with atomic number

18

0

(ii) Elements with same valency have atomic number

16, 17

and

18

(iii) Valency of elements with atomic number

9, 17

and

35

is one
(iv) Element with atomic number

17

is more electronegative than elements with atomic number

16

and

35

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Name	Symbol	Atomic number	Valenc1y
Hydrogen	H	1	1
Helium	He	2	0
Lithium	Li	3	1
Beryllium	Be	4	2
Carbon	C	6	4
Nitrogen	N	7	3
Oxygen	O	8	2
Fluorine	F	9	1
Neon	Ne	10	0
Sodium	Na	11	1
Magnesium	Mg	12	2
Aluminium	Al	13	3
Silicon	Si	14	4
Iron	Fe	26	2, 3
Zinc	Zn	30	2
Chlorine	Cl	17	1
Argon	Ar	18	0
Potassium	K	19	1
Calcium	Ca	20	2
Bromine	Br	35	1