state gov Kerala PSC Degree (Common Preliminary Examination) Mock Test Series 2025 General Science Chemistry Basic Concepts of Chemistry
What is the atomic mass of an element expressed as?
1
Number of atoms in 1 mole of an element
2
Mass of an atom compared to 1/16th of oxygen atom
3
Mass of an atom compared to 1/12th of a carbon-12 atom
4
Total weight of all isotopes of an element