1.Are all materials around you metal or a non-metal? Give reasons. 2.Can a metal or a non-metal be broadly categorized under the heading ELEMENT? If yes, give appropriate reasons. 3.Differentiate between an element and a compound. Give five examples for each. 4.What is an Alloy? 5.What are the advantages of making an alloy? 6.Name any five elements which are coined after the name of the scientists?
Answers
Answer:
Metalloids are included in the legend as they generally behave chemically like nonmetals and are sometimes counted as such.
Apart from hydrogen, nonmetals are located in the p-block. Helium, as an s-block element, would normally be placed next to hydrogen and above beryllium. However, since it is a noble gas, it is instead placed above neon (in the p-block).
In chemistry, a nonmetal (or non-metal) is a chemical element that mostly lacks the characteristics of a metal. Physically, a nonmetal tends to have a relatively low melting point, boiling point, and density. A nonmetal is typically brittle when solid and usually has poor thermal conductivity and electrical conductivity. Chemically, nonmetals tend to have relatively high ionization energy, electron affinity, and electronegativity. They gain or share electrons when they react with other elements and chemical compounds. Seventeen elements are generally classified as nonmetals: most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon); one is a liquid (bromine); and a few are solids (carbon, phosphorus, sulfur, selenium, and iodine). Metalloids such as boron, silicon, and germanium are sometimes counted as nonmetals.
The nonmetals are divided into two categories reflecting their relative propensity to form chemical compounds: reactive nonmetals and noble gases. The reactive nonmetals vary in their nonmetallic character. The less electronegative of them, such as carbon and sulfur, mostly have weak to moderately strong nonmetallic properties and tend to form covalent compounds with metals. The more electronegative of the reactive nonmetals, such as oxygen and fluorine, are characterised by stronger nonmetallic properties and a tendency to form predominantly ionic compounds with metals. The noble gases are distinguished by their great reluctance to form compounds with other elements.
The distinction between categories is not absolute. Boundary overlaps, including with the metalloids, occur as outlying elements in each category show or begin to show less-distinct, hybrid-like, or atypical properties.
Although five times more elements are metals than nonmetals, two of the nonmetals—hydrogen and helium—make up over 99 percent of the observable universe.[1] Another nonmetal, oxygen, makes up almost half of the Earth's crust, oceans, and atmosphere.[2] Living organisms are composed almost entirely of nonmetals: hydrogen, oxygen, carbon, and nitrogen.[3] Nonmetals form many more compounds than metals.[4
1. all the substances around us are metals and nonmetals because they are found in huge quantity in the crust of the earth.
Explanation:
2.metals and nonmetals belong to the element which consists of only one type of atom.
3. An element consists of metals of only one type whereas compound consists of atoms of two or more different types. For example the elements are R gold platinum silver aluminium potassium the compounds are water , sodium chloride ,magnesium sulfate potassium iodide , aluminium hydroxide
4. an alloy is a mixture of two or more metals which help in metallurgical purposes.
5. Alloy help in adding certain qualities to the metal which were not independently present in that metal
6. Five metals which was named after the scientist are Titanium , Strontium , Rutherfordium , Indnaium , Uranium
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