Download App

Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom2 Marks
Question
Hydrogen has three isotopes written as:
$^1_1\text{H},\ ^2_1\text{H},\ ^3_1\text{H}$
Explain why:
  1. These isotopes have almost identical chemical properties.
  2. They are electrically neutral.
✓

Answer

  1. Due to identical electronic configuration containing the same no. of valence electrons, these isotopes have almost identical chemical properties.
  2. All of them have 1 electron and 1 proton, so, they are electrically neutral.

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→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

Which types of ribosomes are found in prokaryotes and eukaryotes?

→
20g silver nitrate solution is added to 20g of sodium chloride solution. What change in mass do you expect after the reaction and why?
→

Enumerate protein fibres of connective tissue.

→
Classify the following as physical or chemical properties:
Most metal oxides form alkalis on interacting with water.
→
An object is moving along a straight line with uniform acceleration. The following table gives the velocity of the object at various instants of time:
Time (in sec.):
0
1
2
3
4
5
6
Velocity (in m/s):
2
4
6
8
10
12
14
Plot the graph.
From the graph,
  1. Find the velocity of the object at the end of 2.5 seconds.
  2. Calculate the acceleration.
  3. Calculate the distance covered in the last 4 seconds.
→
Write two differences between isobars and isotopes. 
→

If 784J of work was done in lifting a 20kg mass, calculate the height through which it was lifted. (8 = 9.8m/s2)

→
What is the SI unit of pressure? Give its value in atm unit.
→
Name any two laws of chemical combination.
→
A car is moving along a straight road at a steady speed. It travels 150m in 5 seconds:
How far does it travel in 6 seconds?
→