Advertisements
Advertisements
प्रश्न
Define the term Mass number.
उत्तर
Mass number refers to the sum of the number of protons and neutrons present in the nucleus of an atom and denoted by A Mass number = Number of protons + Number of neutrons.
APPEARS IN
संबंधित प्रश्न
Give the following a suitable word/phrase
Arrangement of electrons in the shells of an atom.
Multiple Choice Questions
number of valence electrons present in magnesium is
FILL IN THE BLANK
In an atom, the last shell containing electrons is called its..................shell.
FILL IN THE BLANK
The γ-rays are............................ radiations, like light.
WRITE SHORT ANSWER
What is an atom?
Compare an electron, a proton and a neutron in respect of their relative masses and charges.
Compare an electron and a proton in respect of mass and charge.
Define the term Nucleons.
State how electrons are distributed in an atom. Explain in brief the rules which govern their distribution.
Select the correct answer from the choice in the bracket to complete the sentence:
A ________ is a sub-atomic particle with no charge and unit mass.
