Asked/Added Questions From NCERT:

Question 1. Asked on :02 September 2021:03:56:27 PM

The atomic radius of hydrogen atom is:

-Added by Manisha Kumari Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

37 pm.

-Answered by Shruti Srivastva On 12 September 2021:04:46:04 PM

Question 2. Asked on :02 September 2021:03:55:32 PM

How many electrons fluorine and chlorine have in their outermost shell:

-Added by Manisha Kumari Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

seven

-Answered by Shruti Srivastva On 12 September 2021:04:46:24 PM

Question 3. Asked on :02 September 2021:03:54:28 PM

How many horizontal rows in morden periodic table:

-Added by Manisha Kumari Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

seven

-Answered by Shruti Srivastva On 12 September 2021:04:46:40 PM

Question 4. Asked on :02 September 2021:03:53:30 PM

How many vertical columns are in modern periodic table:

-Added by Manisha Kumari Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

Eighteen

-Answered by Shruti Srivastva On 12 September 2021:04:46:56 PM

Question 5. Asked on :02 September 2021:03:52:04 PM

In morden periodic table properties of element are a periodic function of their __________.

-Added by Manisha Kumari Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

Atomic number

-Answered by Shruti Srivastva On 12 September 2021:04:47:08 PM

Question 6. Asked on :09 November 2019:06:43:47 PM

What are the limitations of Dobereiner's Triads?

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Rohit Rajput

Limitations of Dobereiner's classification: Dobereiner could find only three triads; .i.e total of 9 elements only. However the total number of elements were more than that of those encompassed in Dobereiner's Triad. Thus, Dobereiner's could not be classify most of the elements known at that time.

-Answered by Rohit Rajput On 10 November 2019:06:06:48 PM

Question 7. Asked on :11 September 2019:11:23:02 AM

Write the symbol of Phosporus.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

P is the symbol of phosphorous

-Answered by priyanshu kumar On 03 October 2019:12:49:14 PM

Question 8. Asked on :11 September 2019:11:21:34 AM

Write the symbol of Silicon.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar
Si is the symbol of of silicon

-Answered by priyanshu kumar On 03 October 2019:12:49:24 PM

Question 9. Asked on :11 September 2019:11:19:33 AM

Write the symbol of Aluminium.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

All is the symbol of aluminium

-Answered by priyanshu kumar On 03 October 2019:12:49:36 PM

Question 10. Asked on :11 September 2019:11:18:42 AM

Write the symbol of Magnesium.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

Mg is the symbol of magnesium

-Answered by priyanshu kumar On 03 October 2019:12:49:45 PM

Question 11. Asked on :11 September 2019:11:18:04 AM

Write the symbol of Sodium.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

Na is the symbol of sodium

-Answered by priyanshu kumar On 03 October 2019:12:49:55 PM

Question 12. Asked on :11 September 2019:11:17:38 AM

Write the symbol of Neon.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

Ne is the symbol of neon

-Answered by priyanshu kumar On 03 October 2019:12:50:06 PM

Question 13. Asked on :11 September 2019:11:11:45 AM

Write the symbol of Fluorine.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

F is the symbol

-Answered by priyanshu kumar On 03 October 2019:12:50:44 PM

Question 14. Asked on :11 September 2019:11:11:05 AM

Write the symbol of Oxygen.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

Answer is o2

-Answered by priyanshu kumar On 03 October 2019:12:50:53 PM

Question 15. Asked on :11 September 2019:11:09:33 AM

Write the symbol of Nitrogen?

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

N is the symbol of nitrogen

-Answered by priyanshu kumar On 03 October 2019:12:51:09 PM

Question 16. Asked on :11 September 2019:11:06:56 AM

Write the symbol of Carbon.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

c is the symbol of carbon

-Answered by priyanshu kumar On 03 October 2019:12:51:18 PM

Question 17. Asked on :11 September 2019:11:06:24 AM

Write the symbol of Boron?

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

B is the symbol of boron

-Answered by priyanshu kumar On 03 October 2019:12:51:28 PM

Question 18. Asked on :11 September 2019:11:00:44 AM

Write the symbol of Beryllium?

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

Be is the answer

-Answered by priyanshu kumar On 03 October 2019:12:51:37 PM

Question 19. Asked on :11 September 2019:10:59:43 AM

Write the symbol of Lethium.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar
Li.

-Answered by priyanshu kumar On 03 October 2019:12:51:51 PM

Question 20. Asked on :21 August 2019:04:43:17 PM

Write the limitations of Mendeleev's Classification.

-Added by Himanshi Verma Chemistry » Periodic Classification Of Elements

Answer:

Himanshi Verma

1. Position of isotopes could not be explained.

2. No fixed position for hydrogen.

3. Wrong order of atomic masses of some elements could not be explained.

-Answered by Himanshi Verma On 21 August 2019:04:44:39 PM

Question 21. Asked on :20 August 2019:07:40:49 PM

What are the limitations of Mendeleev's classification?

-Added by Himanshi Verma Chemistry » Periodic Classification Of Elements

Answer:

Himanshi Verma

1. No, fixed position can be given to hydrogen in the Mendeleev's classification.

2. There are no any place for isotopes.

3. It was not possible to predict how many elements could be discovered between two elements.

-Answered by Himanshi Verma On 20 August 2019:07:44:51 PM

Question 22. Asked on :28 March 2019:04:29:59 PM

What is Newland's Law of Octaves and what is its limitation?

-Added by Himanshi Verma Science » Periodic Classification Of Elements

Answer:

Manisha kumari

Every eighth element had properties similar to that of that first this law is known as Newland's Law of Octaves. Limitations of law of octaves: The law of octaveshas the following limitations ; (A) The law of octaves was found to be applicable only upto calcium. (B)It was not applicable to elements of higher atomic masses. (C) Newlands placed two elements in the same slot to fit elements in the table.

-Answered by Manisha kumari On 05 April 2019:04:47:09 PM

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