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Why is oxygen atomic number 8?
On the periodic table of elements, oxygen is represented by the symbol O. It has an atomic number of 8 because it has 8 protons in its nucleus.
What is the atomic number of oxygen 11?
Sodium
The Elements, sorted by Atomic Number
| Atomic Number | Symbol | Name |
|---|---|---|
| 9 | F | Fluorine |
| 10 | Ne | Neon |
| 11 | Na | Sodium |
| 12 | Mg | Magnesium |
How do you find the atomic number of oxygen?
The number of protons in a given atom is always equal to its atomic number. For example, the atomic number of oxygen is 8, therefore the total number of protons in an oxygen atom is 8.
Why is the atomic number of sodium 11?
Mass number We know that the atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons. The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass).
What is the atomic number of most atoms of oxygen?
Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms compounds with most elements. Atomic Number of oxygen is 8, it is the number of electrons or protons present in the neutral atom.
How do I get the atomic number?
Now you know that atomic number = number of protons, and mass number = number of protons + number of neutrons. To find the number of neutrons in an element, subtract the atomic number from the mass number.
What does the atomic number identify?
The atomic number of an atom identifies the number of protons in the atom. This is the defining characteristic of an element. An atom can gain or lose neutrons or electrons while retaining its elemental identity. If the number of protons in an atom changes, however, the atom becomes a different element.
What atom has 18 protons?
If you look at the periodic table, argon (Ar) has 18 protons and thus 18 electrons. We can use the number of neutrons (20 neutrons) to find the mass number of the element. The mass number of the element is the sum of the protons and the neutrons.