Oxygen is a non meta element. Atomic Mass of it is 16.
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Oxygen has an atomic mass of approximately 16.
The mass number is the sum of neutrons and protons in the atomic nucleus and is different for each isotope of any element.For example the isotope oxygen-16 has the mass number 16.The mass number is not the atomic mass !!
Multiply the atomic mass of C (Carbon), which is 12, by its charge (12). multiply the atomic mass of H (hydrogen), which is 1, by its charge (22). multiply the atomic mass of O (Oxygen), which is 16, by its charge (11). Add them together as shown below 12(12) + 22(1) + 11(16) = ? 144 + 22 + 171 = ? 166 + 171= ? Atomic mass = 337
The atomic mass number of Sulfur is 32.066. Atomic number: 16. Symbol: S
If you know the mass of one mole of those atoms (the mass number listed on the periodic table), then you divide that number by Avogadro's constant: 6.022x10^23 which gives you the mass of one single atom