MEDIUM
9th CBSE
IMPORTANT
Earn 100

What is responsible for the mass of an atom?

Important Questions on Structure of the Atom

HARD
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 28
The complete symbol of an element is X1123. i. What does the numeral 11 indicate? ii. What does the numeral 23 indicate? iii. Find the number of electrons present in X. iv. Find the number of protons present in X. v. Find the number of neutrons present in X.
HARD
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 29
An element has mass number 28 and atomic number14. Find the number of protons, neutrons and electrons in it. Write the complete symbol of the element.
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 30
What are isotopes? Give an example.
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 31
What are isobars? Give an example. Do isobars exhibit similar chemical properties?
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 32
Why is it that most elements have fractional atomic mass?
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 33
How will you justify the atomic mass of chlorine as 35.5 u?
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 34
Calculate the average atomic mass of chlorine using the following data:
Isotope    Natural abundance (%)    Molar mass
35 Cl                75.77                         34.9689
37 Cl                24.23                          36.9659
 
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 35
The charge of neutron is _____.(write number)