Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

(i) What is the difference between sodium atom and sodium ion? Give any two points.(ii) What is Avogadro's constant?(iii) The element X has valency 3 while the element Y has valency 2. Write the formula of the compound between X and Y.
Asked by Topperlearning User | 09 May, 2014, 03:00: PM
answered-by-expert Expert Answer

(i) (a) Sodium atom is neutral while sodium ion is positively charged.

    (b) Sodium atom catches fire when brought in contact with water while sodium ion does not.

(ii) Avogadro's number is the actual number of molecule in one gram molecule of any substance. Its value is 6.022 x 1023 particles.

(iii) The formula of the compound between X and Y is X2Y3.

Answered by | 09 May, 2014, 05:00: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 9 - Chemistry
what is atom
Asked by rajputanaji290 | 03 Oct, 2023, 09:30: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
(B) An element X has 17 protons and 18 electrons. (a) what is the valency of X? (b) find the number of neutrons in X? (c) What is the mass number of X?
Asked by muditsharma287 | 09 Mar, 2023, 10:10: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
how is protons mass when compared to electron
Asked by shivalaxmi0205 | 08 Mar, 2023, 07:46: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
what is the Mass of electron
Asked by shivalaxmi0205 | 08 Mar, 2023, 07:43: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Why hydrogen atom does not have neutrons
Asked by jssjj | 19 Jan, 2023, 07:25: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
  name and write the formula of atleast 20 elements of everyday use   
Asked by mohammedhaqqani.6b | 14 Jun, 2022, 02:51: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
the ratio by mass of nitrogen and hydrogen in ammonia is 14:3 . calculate the ratio by number of atoms of elements in ammonia molecule .
Asked by jiyajthakor | 28 Feb, 2022, 07:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Assertion reason (A) phosphate ion is a polyatomic anion (R) in phosphate anion 5 atoms are present   
Asked by gillsaabjashanpreetsingh3 | 16 Jan, 2022, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
calculate the formula unit mass of CaCl2
Asked by prachisharma772007 | 16 Jan, 2022, 11:12: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Calculate the molecular mass of h20
Asked by rupasajwan363 | 04 Jan, 2022, 04:17: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×