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Only elements have atomic number. Na3PO4 is not an element it is a compound called Sodium Phosphate. It is made of Sodium(Atomic number 11), Phosphorus(Atomic number 15) and Oxygen(Atomic number 8)
Sodium Phosphate
Na3PO4, also known as sodium phosphate, is a basic compound. When dissolved in water, it dissociates to release hydroxide ions (OH-) which makes the solution basic.
This ratio is different for each compound; for the oxide P4O10 the ratio is 2/5.
Na3PO4 • 12 H2O (s) ----> Na3PO4 (s) + 12 H2O (g)
both
a
Sodium phosphate.
Na3PO4
This formula is Na3PO4.
It is an ionic compound composed of positively charged sodium ions and a negatively charged phosphate ion.
The ratio of the constituents of a mixture cannot be determined.
Na3PO4 (tri-sodium phosphate)
sodium phosphate Na3PO4
The chemical formula of the compound shows the ratio of the atoms of elements in a compound. This must not be confused with the ratio of their masses.
The fixed ratio of the elements in a chemical compound is called its RATIO OF MASSES.
Only elements have atomic number. Na3PO4 is not an element it is a compound called Sodium Phosphate. It is made of Sodium(Atomic number 11), Phosphorus(Atomic number 15) and Oxygen(Atomic number 8)