Elements
Elements
Element term “element” was first used by Robert Boyle in 1661. An element is a pure substance which cannot be split into two or more simpler substances by any physical or chemical means. It is the simplest form of matter. Copper, iron, gold, hydrogen, oxygen, nitrogen and chlorine are examples of elements. At present, more than 118 elements are known. Out of these 92 are natural elements and others are man made. Hydrogen is an element because it cannot be split into two or more simpler substances by any physical or chemical method. Water is not an element because it can be split into two simpler substances (hydrogen and oxygen) by passing an electric current through it.
Classification of elements:
Elements can be broadly divided into two categories— metals and nonmetals. There is also a third category of elements called metalloids. Such elements have properties lying between those of metals and nonmetals. Boron, silicon and arsenic are examples of metalloids.
Metals have Lustre or Shine:-
They are good conductors of heat and electricity. They are malleable and ductile in the solid state. Most metals are solid at room temperature, except mercury which is a liquid. Examples of metals are sodium, zinc, copper, gold, iron and aluminium.
Nonmetals usually lack lustre and are bad conductors of heat and electricity. They are generally gases, and those that are solid are soft and brittle. Bromine is the only example of a liquid nonmetal. Examples of nonmetals are hydrogen, oxygen, nitrogen, sulphur and phosphorus.
Metalloids have properties intermediate between those of metals and nonmetals. Silicon, boron, arsenic, antimony, bismuth, germanium, etc., are metalloids.
Oxygen is an Element:
No other element has yet been found to be present in oxygen. When pure oxygen is made to react with pure hydrogen, only water is formed. Hence, oxygen is considered to be an element.
Antimony and arsenic can be classified as _________________ | |||
| Right Option : C | |||
| View Explanation | |||
An element has only one type of ______________ | |||
| Right Option : A | |||
| View Explanation | |||
An element which is not found in nature is _____________________ | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [20]
It has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
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Cheshta
10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
8thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
Anika Saxena
8thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
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Eshan Arora
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Hridey Preet
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Upmanyu Sharma
7thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
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Yatharthi Sharma
10thThird consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
Ayan Ghosh
8thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thThe experience was nice. I studied here for three years and saw a tremendous change in myself. I started liking subjects like English and SST which earlier I ran from. Extra knowledge gave me confidence to overcome competitive exams. One of the best institutes for secondary education.
Aman Kumar Shrivastava
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Prisha Gupta
8thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
