The triad which is isoelectronic.

Important Questions on Structure of the Atom

HARD

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 6

An element has electronic configuration $2, 8, 4$. It will be classified as

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 7

The isotope of carbon which has same number of neutrons as ${}_8{}^{16}\mathrm{O}$, is used in radiocarbon dating to determine age of old samples of living organisms.

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 8

Cathode rays have

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 9

The isotopes of hydrogen which contain same number of electrons, protons and neutrons

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 10

Which of the following has the highest  $\raisebox{1ex}{$\mathrm{n}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{p}$}\right.$ ratio?

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 11

The number of valence electrons determines

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 12

Atomic number is equal to

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 13

The difference between isotopes and isobars