Download App

Structure of the Atom — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceStructure of the Atom2 Marks
Question
The composition of two atomic particles is given below:
 
X
Y
Protons
8
8
Neutrons
8
9
Electrons
8
8
  1. What is the mass number of X?
  2. What is the mass number of Y?
  3. What is the relation between X and Y?
  4. Which element/ elements do they represent?
✓

Answer

  1. Mass number of X = 8 + 8 = 16
  2. Mass number of Y = 8 + 9 = 17
  3. X and Y are isotopes, as they have the same number of protons but different number of neutrons.
  4. X and Y represent the isotopes of oxygen.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 2 Mark )" from Structure of the Atom→Structure of the Atom — all question types→Science STD 9 question papers→Rajasthan Board STD 9 question papers→Rajasthan Board question paper generator→

Similar questions

Explain the significance of the symbol H.
→
When water is cooled to a temperature x, it gets converted into ice at temperature x by a process called P. And when ice at temperature x is warmed, it gets reconverted into water at the same temperature x in a process called Q.
  1. What is the value of temperature x in Kelvin?
  2. What is the process P known as?
  3. What is the name of energy released during process P?
  4. What is the process Q known as?
  5. What is the name of energy absorbed during process Q?
→
What is a suspension? Give two examples of suspensions.
→
Explain various methods of fertilizer application.
→
Does the acceleration of a freely falling object depend to any extent on the location, i.e. whether the object is on top of Mount Everest or in Death Valley, California? Explain.
→
Distinguish between farmyard manure and compost manure.
→
What are medullated nerve fibres?
→
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
→
What is meant by the ‘molar mass’ of a substance? State the unit in which molar mass is usually expressed.
→
What is meant by (i) homogeneous mixtures, and (ii) heterogeneous mixtures? Give two examples of homogeneous mixtures and two of heterogeneous mixtures.
→