1. Atomic No Of Oxygen Used
2. Atomic No Of Oxygen Gas
3. Atomic No Of Oxygen
4. Atomic No Of Oxygen In Blood
5. Atomic No Of Oxygen

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Oxygen (O) exists as a colourless, odourless gas in the earth’s atmosphere. Comprising 21% of the earth atmosphere it is vital for life on earth. It has the atomic number 8 in the periodic table and belongs in Group 16. It is a non metal with the symbol O. The concentration of atomic oxygen in the mesosphere and lower thermosphere of Earth is derived from THz spectra of its emission at 4.7 THz (63 µm). The high-resolution spectra were measured with the GREAT heterodyne spectrometer on board of SOFIA.

Notes:
• Density of elements with boiling points below 0°C is given in g/l. In a sorted list, these elements are shown before other elements that have boiling points >0°C.
• Earth crust composition average values are from a report by F. W. Clarke and H. S. Washington, 1924. Elemental composition of crustal rocks differ between different localities (see article).
• Group: There are only 18 groups in the periodic table that constitute the columns of the table. Lanthanoids and Actinoids are numbered as 101 and 102 to separate them in sorting by group.
• The elements marked with an asterisk (in the 2nd column) have no stable nuclides. For these elements the weight value shown represents the mass number of the longest-lived isotope of the element.

Abbreviations and Definitions:

No. - Atomic Number; M.P. - melting point; B.P. - boiling point

Atomic number: The number of protons in an atom. Each element is uniquely defined by its atomic number.

Atomic mass: The mass of an atom is primarily determined by the number of protons and neutrons in its nucleus. Atomic mass is measured in Atomic Mass Units (amu) which are scaled relative to carbon, ¹²C, that is taken as a standard element with an atomic mass of 12. This isotope of carbon has 6 protons and 6 neutrons. Thus, each proton and neutron has a mass of about 1 amu.

Isotope: Atoms of the same element with the same atomic number, but different number of neutrons. Isotope of an element is defined by the sum of the number of protons and neutrons in its nucleus. Elements have more than one isotope with varying numbers of neutrons. For example, there are two common isotopes of carbon, ¹²C and ¹³C which have 6 and 7 neutrons respectively. The abundances of different isotopes of elements vary in nature depending on the source of materials. For relative abundances of isotopes in nature see reference on Atomic Weights and Isotopic Compositions.

Atomic weight: Atomic weight values represent weighted average of the masses of all naturally occurring isotopes of an element. The values shown here are based on the IUPAC Commission determinations (Pure Appl. Chem. 73:667-683, 2001). The elements marked with an asterisk have no stable nuclides. For these elements the weight value shown represents the mass number of the longest-lived isotope of the element.

Atomic No Of Oxygen Used

Electron configuration: See next page for explanation of electron configuration of atoms.

Ionization energy (IE): The energy required to remove the outermost electron from an atom or a positive ion in its ground level. The table lists only the first IE in eV units. To convert to kJ/mol multiply by 96.4869. Reference: NIST Reference Table on Ground states and ionization energies for the neutral atoms. IE decreases going down a column of the periodic table, and increases from left to right in a row. Thus, alkali metals have the lowest IE in a period and Rare gases have the highest.

Other resources related to the Periodic Table

• Chemical Evolution of the Universe
  

What is the mass number of oxygen?

2 Answers

The most common Isotope Mass for Oxygen is 16 Atomic Mass Units.

Atomic No Of Oxygen Gas

Explanation:

The Weighted Average Atomic Mass for each element is found on the periodic table (That long decimal number near the bottom of each box). This number is a combination of all the known Isotopes and basically tells you the average mass you would expect per atom if you grabbed a random handful of them.

The Mass Number is the mass of a particular atom individually and is measured in Atomic Mass Units (AMU); these will always be whole numbers.

The most common Isotope is found by rounding the Weighted average found on the periodic table to the nearest whole number.

In this case Oxygen has a Weighted Average Atomic Mass of 15.999 AMU. So the Mass Number is 16.

Explanation:

Mass number#('A')# is the sum of the atomic number#'(Z')#, which is the number of protons, and neutrons #('N')# in the nucleus of a specific isotope of an element #('A=Z+N')#. Isotopes are named for their mass numbers. Oxygen has three naturally occurring isotopes.

The most common isotope of oxygen has 8 neutrons. Its atomic number is 8.

Atomic No Of Oxygen

#'A=Z+N'#
#'A=8+8=16'#
This isotope of oxygen is oxygen-16.

Another isotope of oxygen has 9 neutrons.
#'A=8+9=17'#
This isotope is oxygen-17.

A third oxygen isotope has 10 neutrons.
#'A=8+10=18'#
This oxygen isotope is oxygen-18.

Atomic No Of Oxygen In Blood

The following is the isotopic or nuclear notation of an isotope.

Atomic No Of Oxygen

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