Elements Power Point By Maddie Gaylord Hydrogen Hydrogen

Elements Power. Point By: Maddie Gaylord

Hydrogen • Hydrogen is the lightest element. • It is by far the most abundant element in the universe and makes up about 90% of the universe by weight. • Hydrogen as water (H 2 O) is absolutely essential to life and it is present in all organic compounds. • Hydrogen is the lightest gas. • Hydrogen gas was used in lighter-than-air balloons for transport but is far too dangerous because of the fire risk (Hindenburg).

Helium • Helium is one of the so-called noble gases. • Helium gas is an unreactive, colourless, and odourless monoatomic gas. • Helium is available in pressurised tanks. • Helium is the second most abundant element in the universe after hydrogen. • Helium is used in lighter than air balloons and while heavier than hydrogen, is far safer since helium does not burn.

Lithium • Lithium is a Group 1 (IA) element containing just a single valence electron (1 s 22 s 1). • Lithium is a solid only about half as dense as water and lithium metal is the least dense metal. • A freshly cut chunk of lithium is silvery, but tarnishes in a minute or so in air to give a grey surface. • Its chemistry is dominated by its tendency to lose an electron to form Li+. • Lithium is mixed (alloyed) with aluminium and magnesium for light-weight alloys, and is also used in batteries, some greases, some glasses, and in medicine.

Beryllium • Beryllium is a Group 2 (IIA) element. • It is a metal and has a high melting point. • At ordinary temperatures, beryllium resists oxidation in air. • Beryllium compounds are very toxic. • Its ability to scratch glass is probably due to the formation of a thin layer of the oxide.

Boron • Boron is a Group 13 element that has properties which are borderline between metals and nonmetals (semimetallic). • It is a semiconductor rather than a metallic conductor. • Chemically it is closer to silicon than to aluminium, gallium, indium, and thallium. • Crystalline boron is inert chemically and is resistant to attack by boiling HF or HCl. • Symbol: B

Carbon • Symbol: C • Atomic number: 6 • Atomic weight: 12. 0107

Nitrogen • Symbol: N • Atomic number: 7 • Atomic weight: 14. 0067

Oxygen • Symbol: O • Atomic number: 8 • Atomic weight: 15. 9994

Fluorine • Symbol: F • Atomic number: 9 • Atomic weight: 18. 9984032

Neon • Symbol: Ne • Atomic number: 10 • Atomic weight: 20. 1797

Sodium • Symbol: Na • Atomic number: 11 • Atomic weight: 22. 98976928

Magnesium • Symbol: Mg • Atomic number: 12 • Atomic weight: 24. 3050

Aluminum • Symbol: Al • Atomic number: 13 • Atomic weight: 26. 9815386

Silicon • Symbol: Si • Atomic number: 14 • Atomic weight: 28. 0855

Phosphorus • Symbol: P • Atomic number: 15 • Atomic weight: 30. 973762

Sulfur • Symbol: S • Atomic number: 16 • Atomic weight: 32. 065

Chlorine • Symbol: Cl • Atomic number: 17 • Atomic weight: 35. 453

Argon • Symbol: Ar • Atomic number: 18 • Atomic weight: 39. 948

Potassium • Symbol: K • Atomic number: 19 • Atomic weight: 39. 0983

Calcium • Symbol: Ca • Atomic number: 20 • Atomic weight: 40. 078

Scandium • Symbol: Sc • Atomic number: 21 • Atomic weight: 44. 955912

Titanium • Symbol: Ti • Atomic number: 22 • Atomic weight: 47. 867

Vanadium • Symbol: V • Atomic number: 23 • Atomic weight: 50. 9415

Chromium • Symbol: Cr • Atomic number: 24 • Atomic weight: 51. 9961

Manganese • Symbol: Mn • Atomic number: 25 • Atomic weight: 54. 938045