please please answer my questions
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4. How do atoms exist?
5. Define a mole. What is the importance of a mole?
6. Calculate the mass of one atom of oxygen
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atoms exist as combination of proton & neutron in the center of the atom & electrons revolving around it at certain energy levels.
The mole is the unit of measurement in the International System of Units (SI) for amount of substance.
It is defined as the amount of a chemical substance that contains as many elementary entities, e.g., atoms, molecules, ions, electrons, or photons, as there are atoms in 12 grams of carbon-12 (12C), the isotope of carbon with relative atomic mass12 by definition.
This number is expressed by the Avogadro constant, which has a value of 6.022140857(74)×1023 mol−1. The mole is one of the base units of the SI, and has the unit symbol mol.
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