Define atomic size. explain its unit with example.
Define atomic mass of element.
What is meant by saying that,' the atomic mass of oxgen is 16?
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An atom of oxygen-16, for example, has a mass of 2.66 × 10 -23 g. ... An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. For example, one atom of helium-4 has a mass of 4.0026 amu.
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Atomic size :
The distance from the center of the nucleus of an isolated atom to the outer most shell containing electrons is known as atomic size
The unit of measurement is Angstorms it is denoted by (A°) .
Explanation:
Atomic mass: The atomic mass of an element is the average mass of an element measured in atomic mass unit . The atomic mass is a weighted average of all the isotopes of that element.
oxygen has the atomic mass of 15.99491461956 u
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