66 questions · Class 9 · CBSE
What is the function of mitochondria?
Explain the relationship between atomic structure and chemical properties.
What are the main features of Bohr’s atomic model?
Write the symbols of isotopes of hydrogen.
Calculate the number of neutrons in Calcium-40.
An element has atomic number 15. Find the number of electrons in each shell.
Write the electronic configuration of sodium and explain its valency.
An atom contains 8 electrons and 8 neutrons. Identify the element.
Calculate the mass number of an atom having 17 protons and 18 neutrons.
An atom has atomic number 11 and mass number 23. Find the number of neutrons.