Chemistry
Grade-8
Easy
Question
Practically, the atomic mass can be represented by:
- Sum of the number of proton and neutron
- Sum of the number of proton and electron
- Only the number of protons
- Only the number of electrons
Hint:
The weight of the nucleus is the weight of the atom.
The correct answer is: Sum of the number of proton and neutron
- The atomic mass of an element is the average mass of the element's atoms measured in atomic mass units.
- Atomic mass is the weighted average of all isotopes of that element, the mass of each isotope multiplied by the abundance of that particular isotope.
- The number of protons and the number of neutrons together determine the mass number of the element: mass number = proton + neutron.
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