Answer the following questions-1-How are isotopes of different elements placed in Modern Periodic Table-2-What should be the position of H2O nbsp-in Modern Periodic Table-Why-3-Write the name-symbol-electronic configuration of 1st 10 elements

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Standard XII

Chemistry

Periodicity

Answer the fo...

Question

Answer the following questions-
1.How are isotopes of different elements placed in Modern Periodic Table?
2.What should be the position of H2O in Modern Periodic Table?Why?
3.Write the name,symbol,electronic configuration of 1st 10 elements

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Solution

$1) M o d e r n p e r i o d i c t a b l e i s a r r a n g e d b a s e d o n t h e i n c r e a \sin g a t o m i c n u m b e r a n d i s o t o p e s a r e e l e m e n t s w i t h s a m e a t o m i c n u m b e r a n d d i f f e r e n t m a s s n u m b e r . S o a l l i s o t o p e s o f a n e l e m e n t a r e a l l o c a t e d w i t h \sin g l e p a l c e o n l y . E x ., H y d r o g e n 2) W a t e r i s a c o m p o u n d a n d p e r i o d i c t a b l e i s f o r e l e m e n t s o n l y . S o w a t e r h a s n o p l a c e .$

Name Symbol Atomic number Electronic configuration K,L,M,N

Hydrogen H 1 1

Helium He 2 2

Lithium Li 3 2,1

Beryllium Be 4 2,2

Boron B 5 2,3

Carbon C 6 2,4

Nitrogen N 7 2,5

Oxygen O 8 2,6

Fluorine F 9 2,7

Neon Ne 10 2,8

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Similar questions

Q. (a) How were the positions of isotopes of an element decided in the modern periodic table?
(b) How were the positions of cobalt and nickel resolved in the modern periodic table?
(c) where should hydrogen be placed in the modern periodic table? Give reason for your answer.

(a) State modern periodic law.

(b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table?

(d) Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?

(e) Name the scientist who prepared the modern periodic table.

Elements with configuration 2, 8, 2 and 2, 7 are placed in Modern Periodic Table write the position in Modern Periodic table and identify their valencies and write the formula of compound formed by their combination

Q. (a) What were the two major shortcomings of Mendeleev's periodic table? How have these been removed in the modern periodic table?
(b) Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern periodic table do these two elements belong? What type of bond will be formed between them and why?
(c) To which groups of the modern periodic table do the elements X and Y belong? Give reason for your answer.
(d) What could the elements X and Y be? Write their names and symbols.

Q. Which of the following statement(s) about the Modern periodic table is/are incorrect?
(i) The elements in the Modern periodic table are arranged on the basis of their decreasing atomic number.
(ii) The elements in the Modern periodic table are arranged on the basis of their increasing atomic number
(iii) Isotopes are placed in an adjoining group(s) in the periodic table.

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Name	Symbol	Atomic number	Electronic configuration K,L,M,N
Hydrogen	H	1	1
Helium	He	2	2
Lithium	Li	3	2,1
Beryllium	Be	4	2,2
Boron	B	5	2,3
Carbon	C	6	2,4
Nitrogen	N	7	2,5
Oxygen	O	8	2,6
Fluorine	F	9	2,7
Neon	Ne	10	2,8

Answer the following questions- 1.How are isotopes of different elements placed in Modern Periodic Table? 2.What should be the position of H2O in Modern Periodic Table?Why? 3.Write the name,symbol,electronic configuration of 1st 10 elements

Answer the following questions-
1.How are isotopes of different elements placed in Modern Periodic Table?
2.What should be the position of H2O in Modern Periodic Table?Why?
3.Write the name,symbol,electronic configuration of 1st 10 elements