MEDIUM
9th CBSE
IMPORTANT
Earn 100

The total number of electrons in a nitrogen atom is 7. Find the number of valence electrons in it.

Important Questions on Structure of Atom

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 2
What is the general name of the elements having 8 electrons in the valence shell of their atoms?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 3
Which noble gas has less than 8electrons in the valence shell of its atom? What is this number?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 4
State one use of radioactive isotopes in medicine.
EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 5
Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 6

Name the radioactive isotope which is used in the treatment of cancer. 

A : Iodine-153

B : Cobalt- 60

C : Carbon- 13

Enter your answer as A, B, or C.

HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 7
Which radioactive isotope is used to determine the activity of thyroid gland? (Iodine-131/ Uranium-235)
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 8
State one use of radioactive isotopes in industry.
EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Very Short Answer Type Questions>Q 9
The radioactive isotope of iodine is used for making the medicine called tincture iodine.