Calcium Hydrogen Copper Nickel Chlorine Helium Oxygen Iron Iodine Arsenic

Name: Calcium Symbol: Ca Atomic Number: 20 Atomic Mass: amu Melting Point: °C ( °K, °F) Boiling Point: °C ( °K, °F) Number of Protons/Electrons: 20 Number of Neutrons: 20 Classification: Alkaline Earth Crystal Structure: Cubic 293 K: 1.55 g/cm3 Color: Silvery Date of Discovery: 1808 Discoverer: Sir Humphrey Davy Name Origin: From the latin word calcis (lime) Uses: life forms for bones and shells Obtained From: chalk, limestone, marble. 3.5% of crust

Name: Hydrogen Symbol: H Atomic Number: 1 Atomic Mass: amu Melting Point: °C ( °K, °F) Boiling Point: °C ( °K, °F) Number of Protons/Electrons: 1 Number of Neutrons: 0 Classification: Non-metal Crystal Structure: Hexagonal 293 K: g/cm3 Color: colorless Date of Discovery: 1766 Discoverer: Henry Cavendish Name Origin: From the Greek words hudôr (water) and gennan (generate) Uses: Balloons, metal refining Obtained From: mines, oil, gas wells

Name: Copper Symbol: Cu Atomic Number: 29 Atomic Mass: amu Melting Point: °C ( °K, °F) Boiling Point: °C ( °K, °F) Number of Protons/Electrons: 29 Number of Neutrons: 35 Classification: Transition Metal Crystal Structure: Cubic 293 K: 8.96 g/cm3 Color: red/orange Date of Discovery: Known to the ancients Discoverer: Unknown Name Origin: From the Latin word cyprium, after the island of Cyprus Uses: electrical conductor, jewelry, coins, plumbing Obtained From: chalcopyrite, coveline, chalcosine

Name: Nickel Symbol: Ni Atomic Number: 28 Atomic Mass: amu Melting Point: °C ( °K, °F) Boiling Point: °C ( °K, °F) Number of Protons/Electrons: 28 Number of Neutrons: 31 Classification: Transition Metal Crystal Structure: Cubic 293 K: g/cm3 Color: white Date of Discovery: 1751 Discoverer: Alex Cronstedt Name Origin: From the German word kupfernickel (false copper) Uses: electroplating metal alloys, nickel-cadmium batteries Obtained From: pentlandite

Name: Chlorine Symbol: Cl Atomic Number: 17 Atomic Mass: amu Melting Point: °C ( °K, °F) Boiling Point: °C ( °K, °F) Number of Protons/Electrons: 17 Number of Neutrons: 18 Classification: Halogen Crystal Structure: Orthorhombic 293 K: g/cm3 Color: green Date of Discovery: 1774 Discoverer: Carl Wilhelm Scheele Name Origin: From the Greek word khlôros (green) Uses: Water purification, bleaches Obtained From: Salt

Name: Helium Symbol: He Atomic Number: 2 Atomic Mass: amu Melting Point: °C (1.15 °K, °F) Boiling Point: °C ( °K, °F) Number of Protons/Electrons: 2 Number of Neutrons: 2 Classification: Noble Gas Crystal Structure: Hexagonal 293 K: g/cm3 Color: colorless Date of Discovery: 1895 Discoverer: Sir William Ramsey Name Origin: From the Greek word hêlios (sun) Uses: balloons, deep sea diving Obtained From: natural gas deposit, air

Name: Oxygen Symbol: O Atomic Number: 8 Atomic Mass: amu Melting Point: °C ( °K, °F) Boiling Point: °C (90.15 °K, °F) Number of Protons/Electrons: 8 Number of Neutrons: 8 Classification: Non-metal Crystal Structure: Cubic 293 K: g/cm3 Color: colorless Date of Discovery: 1774 Discoverer: Joseph Priestly Name Origin: From the Greek words oxus (acid) and gennan (generate) Uses: supports life Obtained From: from liquid air

Name: Iron Symbol: Fe Atomic Number: 26 Atomic Mass: amu Melting Point: °C ( °K, °F) Boiling Point: °C ( °K, °F) Number of Protons/Electrons: 26 Number of Neutrons: 30 Classification: Transition Metal Crystal Structure: Cubic 293 K: 7.86 g/cm3 Color: Silvery Date of Discovery: Known to the ancients Discoverer: Unknown Name Origin: Latin Symbol Origin: From the Latin word ferrum (iron) Uses: steel, hemoglobin (carries oxygen in blood) Obtained From: iron ores

Name: Arsenic Symbol: As Atomic Number: 33 Atomic Mass: amu Melting Point: °C ( °K, °F) Boiling Point: °C ( °K, °F) Number of Protons/Electrons: 33 Number of Neutrons: 42 Classification: Metalloid Crystal Structure: Rhombohedral 293 K: 5.72 g/cm3 Color: Gray Date of Discovery: Known to the ancients Discoverer: Unknown Name Origin: From the Greek word arsenikos and the Latin word arsenicum Uses: Poison, conducts electricity, semiconductors Obtained From: mispickel

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