Chemistry of Metals and Alloys

In Newlands' periodic table, cobalt and nickel were placed together in the same slot because they had similar properties, despite their atomic weight differences.

The coins made by different rulers using metals like gold, silver, copper are important source of history. From these coins we learn about the rulers. Different rulers have different type of coins.

Gold was the first metal that came into use by the Prehistoric man. It was discovered around 6000 BCE. It was a soft metal and were therefore predominantly used for decoration and bullion for trade. Copper came into use soon after gold.

Colloidal sulfur is a suspension of fine sulfur particles, usually in a gum base. A good way to think about this is if one were to grind up pure sulfur and dust it into a gelatin mix before it firmed up. Colloidal sulfur is a homoeopathic 'natural' remedy used to treat skin conditions such as acne, psoriasis, eczema, and dermatitis. Colloidal sulfur can be taken orally or mixed with other ingredients and used as soap or shampoo.

Sulfur is lighter weight element and can serve as a powerful antioxidant, removing free radicals of oxygen and fluorine. Overall, colloidal sulfur is a safe substance that has been used throughout human history as a treatment for skin conditions and can be used today as an effective diet supplement.

Lithium is lightest elemental metal nearly half as dense as water, so it floats on the surface and ultimately disappears, giving off hydrogen gas and forming a colourless solution of lithium hydroxide.

Answer is A.

Most heating elements use Nichrome 80/20 (80% nickel, 20% chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time. Material beneath this layer will not oxidize, preventing the wire from breaking or burning out.
Hence, nichrome is used as heating elements.

For most of the materials, elasticity decreases with temperature. One exception is invar steel.

Swarna Bhasma is prepared from Gold. It is used in Ayurvedic treatment of infertility, asthma, tissue wasting, poisoning etc. This medicine should only be taken strictly under medical supervision.

Silicon is a semiconductor material that serves as the primary base for manufacturing integrated circuits and microchips.

Iron, cobalt and nickel are the examples of ferromagnetic material.

Diamagnetic substances are those which are freebly repelled by the magnetic field.
$\therefore$ Copper, Hydrogen, Silver are diamagnetic as their atoms have net magnetic dipole moment zero.

Circuit boards contain small quantities of various precious and heavy metals. Among them, gold is used for plating connectors and contacts due to its excellent conductivity and corrosion resistance, making it the most valuable recyclable component per unit mass.

Synthetic elements, particularly those with high atomic numbers, are often produced through nuclear reactions and are found within the actinide series and beyond (transuranic elements).

• The metal which is used as a raw material for the manufacture of heavy machinery is iron. Manufacturing of heavy machinery, equipment and bulk tools fall under heavy machinery.
  
• Iron and steel industry is a very good example of heavy industry all most all the manufacturing process involves use of iron and steel like shipbuilding, manufacture of trains, trucks etc. It is often referred to as backbone of modern industry.
  

Beryllium cannot give flame test. Beryllium has small size. It strongly binds its electrons. Thus it has high ionization enthalpy. The thermal energy of flame is not sufficient to excite its electrons.