The mass of an electron is (1) equal to the mass of a proton (2) equal to the mass of a neutron (3) greater than the mass of a proton (4) less than the mass of a neutron 18 is Argon with symbol Ar Now we need to find the mass number of Argon . Which particles are found in the nucleus of an argon atom? Finding the number of protons, neutrons and electrons of elements. Oh. Neutral Atom of Chlorine Atomic Number= 1""7 Number of protons = I1 Number of electrons = I'1 Is the last energy level full? This question was the best answered on the paper and generally well answered question. : Protons, Electrons, and Neutrons, continued 17. is also 18. The mass of Argon is 39.944 which is that mixture of isotopes. Mostly Argon-40. Neutron is 1.0086652 atomic mass units. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). The center of the atom is called the nucleus. a brief scan of Wikipedia reveals that argon has numerous isotopes, of which the most abundant by far is Argon 40; that is 18 protons and 22 neutrons. (18+22=40). Name: Argon Symbol: Ar Atomic Number: 18 Atomic Mass: 39.9 Number of Protons/Electrons: 18 Number of Neutrons: 22 Classification: Noble Gases Discovery: 1894 Discoverer: Sir … Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. And the element with atomic no. of -36 and -38. In this case the number of protons is 18,So,the atomic no. So, Argon-40 would seem to be: 18 electrons which requires 18 protons and 22 neutrons. Atomic Mass ='ÿrounded) Number of neutrons = I ÿ' Number of Energy Levels =ÿ 18. Part I: Protons, Electrons and Neutrons, continued Part ! There are 22 neutrons in one atom of argon. argon has a greater proportion of heavier isotopes / OWTTE / argon has a greater number of neutrons; a. 19 protons and 18 electrons; b. Examiners report. Learn with flashcards, games, and more — for free. So not all argon atoms have 22 neutrons, but most of them do in the natural world. It is mostly Argon-40; small amts. This tells you that it has 18 protons. On the periodic table, argon's atomic number is 18. -Argon Ar -Sulfur S - ... How many protons, electrons, and neutrons are in an atom? The chemical symbol for Argon is Ar . 1. (1) protons and electrons (2) protons and neutrons (3) protons and neutrons (4) positrons and electrons : 3 : 3 : 3. Number of Protons: 26: Number of Neutrons: 30: Number of Electrons: 26: Melting Point: 1535.0° C: Boiling Point: 2750.0° C: Density: 7.86 grams per cubic centimeter: Normal Phase: Solid: Family: Transition Metal: Period: 4: Cost: Unknown . Proton is, I think, 1.0078252 amu. 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