a and b are two alloys of gold and copper?
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A and B are two alloys of gold and copper prepared by mixing metals in the proportions 7 : 2 and 7 : 11 respectively. If equal quantities of the alloys are melted to form a third alloy C, proportion of gold and copper in C will be. 1). 24 litre of a mixture contains milk and water in the ration 7 : 5.
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So, gold is a metal known as a transition metal, meaning that its number of valence electrons is not always constant, and will depend on the formula it is involved in. However, gold most typically has one (1) valence election, and occasionally three (3) valence electrons.
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Copper is a base metal, while brass is an alloy. As a base metal, copper holds a place on the periodic table of elements. Copper is found naturally in the state that it is in, while brass is not. Brass is a man-made metal.
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22 Karat Gold: It contains 22 parts of gold mixed with 2 parts of other metals such as copper, zinc. Due to other traces of metal in the composition, it is harder than a 24K pure gold and thus, appropriate to make jewellery. Gold of this karat is also known as '916 gold' as it comprises 91.67% of pure gold.
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Though both gold and platinum are among least reactive transition element metals, but still if we look at the reactivity series of metals we find that gold is more reactive than platinum.
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Pure gold is slightly reddish yellow in color, but colored gold in various other colors can be produced. Colored golds can be classified in three groups: Alloys with silver and copper in various proportions, producing white, yellow, green and red golds. These are typically malleable alloys.
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An amalgam is an alloy of mercury with another metal.
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Like all chemical elements, silver and gold are defined by their number of protons: silver has 47, and gold has 79. The work here doesn't change the number of protons in an atom of silver; otherwise it would no longer be considered silver.
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Brass vs. Bronze. Brass and Bronze are metal alloys used extensively in everyday objects. While brass is an alloy of copper and zinc, bronze is an alloy consisting mainly of copper, combined most often with tin, but at times also with other metals.
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Lead is heavier than gold in atomic weight at 207.20 versus gold's 196.97. In terms of density, gold is far heavier being 19.28 on the periodic table. Lead on the other hand is only 11.34. The reason gold's density is heavier is due to the structure of how tightly packed the atoms are around the nucleus.
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The different colors come from the metals used in the alloys. Yellow gold is gold alloyed with silver, copper and zinc and is closest to the natural color of pure gold. White gold is gold alloyed with platinum, or paladium, nickle and zinc. Rose gold is gold alloyed with copper and silver.
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Gold is more durable than sterling silver. It is more scratch-resistant and it doesn't tarnish. Both gold and silver are durable, however, because they are both precious metals. Sterling silver is 92.5 percent pure silver and 7.5 percent metal alloy.
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Yellow Gold is simply pure Gold mixed with alloy metals like Copper and Zinc, which gives the material its sunny colour.
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Lead (atomic number 82) and gold (atomic number 79) are defined as elements by the number of protons they possess. Changing the element requires changing the atomic (proton) number. ... Transmutation of lead into gold isn't just theoretically possible - it has been achieved..
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Bronze is an alloy of copper and tin. Tin is a slightly bigger atom than copper. In bronze, typically 5 – 10% is tin and the rest is copper. The slightly larger tin atoms replace copper atoms in the copper crystalline structure as shown in the figure below.
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Other elements sometimes included are the group 11 metals copper, silver and gold (which are usually considered to be transition metals); the group 12 metals zinc, cadmium and mercury (which are otherwise considered to be transition metals); and aluminium, germanium, arsenic, selenium, antimony, tellurium, and polonium ...
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Gold alloys are used for fillings, crowns, bridges, and orthodontic appliances. Gold is used in dentistry because it is chemically inert, nonallergenic, and easy for the dentist to work.