Atomic Number of Argon is 18.. Chemical symbol for Argon is Ar. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Argon has atomic number of 18 and mass number of 40 calcium has atomic 20 and mass number 40 calcium and argon are examples of -----Answer: Atoms of different elements with different atomic numbers and the same mass number are known as isobars. The atomic number is the number of protons in the nucleus of an atom. The longest-lived radioactive isotopes are 39 Ar with a half-life of 269 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days. Melting point of Argon is -189,4 °C and its the boiling point is -185,9 °C. Period Number: 3. Did you know: Argon has three stable isotopes; the most abundant at 99.60% is argon-40 Argon isotopes are used as precursors in the production of radioisotopes. It is very simplest element. Argon makes up 0.93% of the earth's atmosphere, making it the third most abundant gas. Complete the following table: Name Symbol Atomic number Mass Number Number of neutrons Number of Electrons Charge hydrogen-2 2 H 1 2 1 1 0 3 H sodium-22 22 Na + 10 12 24 12 12 25 13 46 Ti-2 107 Ag 19 F-1 carbon-12 6 carbon-13 6 carbon-14 6 carbon-12 7 carbon-12 5 4 He 8 8 10 argon-40 18 18 70 Ga 70 Ga +3 4 9 2 7 8 8 17. It is in group 18 of the periodic table and is a noble gas. Argon : Argon is an Nobel gas It give inert atmosphere . Argon is obtained from the air as a byproduct of the production of oxygen and nitrogen. It is in group 18 of the periodic table and is a noble gas. Ar-40 and Ar-38 are used in the production of radioactive K-38 which can be used as a blood flow tracer. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present). Argon is a chemical element with the symbol Ar and atomic number 18. Group Name: Noble Gas. It is found by the process of cooling air It is 3 rd most found element in earth crust . Ar-40 is used in the production of radioactive Ar-41 … Argon was the first noble gas to be discovered. Atomic mass: 39.948 u ± 0.001 u. Group Number: 18. M60b-1 (27.62966 eV) Ref. M60b Argon is a chemical element with symbol Ar and atomic number 18. On the Earth, 40 Ar makes up 99.6% of natural argon. But it was discovered in 1894 by Lord Rayleigh and Sir William Ramsay. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934%. Argon was discovered by Sir William Ramsay, a Scottish chemist, and Lord Rayleigh, an English chemist, in 1894. Argon (18 Ar) has 26 known isotopes, from 29 Ar to 54 Ar and 1 isomer (32m Ar), of which three are stable (36 Ar, 38 Ar, and 40 Ar). Atomic number: 18. Ar I Ground State 1s 2 2s 2 2p 6 3s 2 3p 6 1 S 0 Ionization energy 127109.842 cm-1 (15.759610 eV) Ref. Atomic Number of Argon. Atomic Mass, Number, Physical, Chemical properties, Electronic configuration, Valency, Chemical reaction, Uses. Argon – Learn all details regarding Argon in Periodic Table i.e. Isotopes of Argon (click to see decay chain): 30 Ar 31 Ar 32 Ar 33 Ar 34 Ar 35 Ar 36 Ar 37 Ar 38 Ar 39 Ar 40 Ar 41 Ar 42 Ar 43 Ar 44 Ar 45 Ar 46 Ar 47 Ar 48 Ar 49 Ar 50 Ar 51 Ar 52 Ar 53 Ar Atomic weight of Argon is 39.948 u or g/mol. VHU99 Ar II Ground State 1s 2 2s 2 2p 6 3s 2 3p 5 2 P° 3 / 2 Ionization energy 222848.3 cm-1 (27.62966 eV) Ref. Number of protons in Argon is 18. Argon was suspected to be present in air by Henry Cavendish in 1785. Symbol for argon is Ar to be present in air by Henry in... 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