EASY
9th CBSE
IMPORTANT
Earn 100

Why do the isotopes of same element have similar chemical properties?

Important Questions on Structure of Atom

EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 3
Why do elements have fractional atomic masses?
MEDIUM
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 4
Define valency on the basis of number of valence electrons in an atom.
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 5
Name an element, which has a duplet structure.
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 6
What do you understand by the term isotope?
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 7
What is the main cause of existence of isotopes?
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 8
Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 9

An element X has a mass number 4 and atomic number 2. Write the valency of this element.

EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 10
The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?