Chemistry · Physics

Atomic Structure and Mass

277 Questions

Atomic structure and mass focus on the composition of atoms, including protons, neutrons, electrons, and isotopes. This topic is essential for the chemistry sections in engineering and civil services competitive exams. Review these questions to practice calculating atomic mass, neutron count, and isotopic distributions.

Atomic mass unit calculationsNeutron and proton countsIsotopic distribution averagesLaw of triadsRest energy of atoms

Atomic Structure and Mass Questions

Multiple choice

Which of the following elements tend to have their atomic masses in decimals?

  1. Elements having different isotopes

  2. Elements having different isobars

  3. Elements with variable valencies

  4. Elements with tendency to form cations

  5. Elements with tendency to form anions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An element may have different isotopes. The mass of a natural element is taken as the average mass of all naturally occurring isotopes of that element.