The Periodic Table



The Periodic Table

- 105 elements in total

- 93 are stable and non-reactive with oxygen (O2) or water (H2O)

- Classification by electron configuration

- Atomic numbers in sequence

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Elements for Engineering Use

Eliminate:

- Rare Earths (non-stable)

- Actinides (radioactive)

- Gases and Liquids

- Semi-metals

35 Important Engineering Elements:

- Light Metals (Magnesium, Mg; Titanium, Ti; Aluminum, Al;

Beryllium, Be; Lithium, Li)

- Rare Earths (Scandium, Sc; Yttrium, Y; Tantalum, Ta; Rubidium, Ru; Radium, Rd;

Rhenium, Re; Osmium, Os; Iridium, Ir; Cadmium, Cd; Indium, In;

Thallium, Tl)

- Steel Additives (Vanadium, V; Chromium, Cr; Manganese, Mn; Cobalt, Co; Nickel, Ni)

- Nuclear Metals (Zirconium, Zr; Hafnium, Hf)

- Ferrous Alloys (Iron, Fe, not used in pure form due to oxidation and corrosion)

- Pure Copper, Cu (Used in electrical applications, bronzes, and brasses)

- Pure Zinc, Zn (Low melting point, brittle)

- Refractory Elements (Niobium, Nb; Molybdenum, Mo; Tungsten, W; Tantalum, Ta)

- Precious Metals (Palladium, Pd; Platinum, Pt; Gold, Au; Silver, Au)

- Corrosion Resistance (Tin, Sn, for plating)

- Joints (Lead, Pb, is ductile and malleable)

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