It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Number of Protons, 10. Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. Nickel is a silvery-white lustrous metal with a slight golden tinge. The chemical symbol for Niobium is Nb. The name samarium is after the mineral samarskite from which it was isolated. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. It is even less abundant than the so-called rare earths. Potassium. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. The chemical symbol for Zinc is Zn. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Elemental sulfur is a bright yellow crystalline solid at room temperature. of protons" + "no. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. The chemical symbol for Samarium is Sm. The atom of sodium has 11 electrons, 11 protons along with 12 neutrons, but Na+ contains one less electron, 11 protons along with 12 neutrons, as the ion has lost 1 electron. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. … It occurs on Earth as the decay product of various heavier elements. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Properties of atomic nuclei (atomic mass, nuclear cross-sections) are determined by the number of protons and number of neutrons (neutron number). Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. The chemical symbol for Polonium is Po. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. It can be observed from the chart that there are more neutrons than protons in nuclides with Z greater than about 20 (Calcium). Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. 2) You may not distribute or commercially exploit the content, especially on another website. #color(blue)(ul(color(black)("mass number" = "no. Only about 5×10−8% of all matter in the universe is europium. 1) You may use almost everything for non-commercial and educational use. There are 19 protons and 20 neutrons and so the mass number A = 19 + 20 … Name: Sodium Symbol: Na Atomic Number: 11 Atomic Mass: 22.98977 amu Melting Point: 97.72 °C (370.87 K, 207.9 °F) Boiling Point: 883 °C (1156 K, 1621 °F) Number of Protons/Electrons: 11 Number of Neutrons: 12 Classification: Alkali Metal Crystal Structure: Cubic Density @ 293 K: 0.971 g/cm 3 Color: silvery Atomic Structure Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Because the atom cannot be broken down into its fundamental particles unless the energy for the missing mass is supplied from outside it, this energy is called the binding energy of the nucleus. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. The chemical symbol for Astatine is At. Zirconium is widely used as a cladding for nuclear reactor fuels. 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