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CBSE Class 10 Answered

name two elements of first period in modern periodic table
Asked by kavithasenthil148 | 06 Feb, 2021, 07:09: PM
answered-by-expert Expert Answer
First period contains 2 elements and is called very short period. Hydrogen and Helium are the two elements placed in this period.
Answered by Ramandeep | 08 Feb, 2021, 01:11: PM

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CBSE 10 - Chemistry
name two elements of first period in modern periodic table
Asked by kavithasenthil148 | 06 Feb, 2021, 07:09: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
how many elements were discovered at the of newland
Asked by mina6poonam | 21 Jan, 2021, 04:57: PM
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CBSE 10 - Chemistry
can you tell me about structure of atom and electric spectrum and about quantum numbers
Asked by dudalaganesh | 04 May, 2020, 08:35: AM
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CBSE 10 - Chemistry
state three main points of difference between Mendeleev periodic table and Modern Periodic Table
Asked by abhisv8953 | 21 Apr, 2020, 02:59: PM
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CBSE 10 - Chemistry
Write the merits of dobereiner's triads.
Asked by bikashlakhya2003 | 23 Jan, 2020, 07:40: PM
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CBSE 10 - Chemistry
What is meant by (I) a group, and (ii) a period, in a periodic table ?
Asked by webfaridisit | 06 Jan, 2020, 08:56: PM
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CBSE 10 - Chemistry
The valency of an element whose electronic configuration is 2
Asked by vermamahima021982 | 27 Aug, 2019, 09:50: PM
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CBSE 10 - Chemistry
The position of cobalt and nickel was anomalous pair in Mendeleev's periodic table. Please explain if it was merit or demerit of Mendeleev's periodic table?
Asked by saradamahapatra9999 | 10 Aug, 2019, 11:35: AM
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CBSE 10 - Chemistry
Write note on position of isotopes in the Mendeleev's and modern periodic table  
Asked by prathameshmane3622 | 10 Jul, 2019, 08:52: PM
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CBSE 10 - Chemistry
Dear Sir/Madame, Can you please tell me what are the limitations of Dobeniers's law according to the NCERT textbook and nothing extra. Thank you.
Asked by 123cmb123 | 12 Dec, 2018, 10:02: PM
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