Isotopes of an element have:

Important Questions on Structure of the Atom

EASY

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 17

Number of valence electrons in ${\mathrm{Cl}}^{-}$ ion is

EASY

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 18

Which one of the following is a correct electronic configuration of sodium?

HARD

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 19

Complete the following table: