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.
Which of the following are correct : (a) An element is a pure substance which cannot be split into two or more simpler substances by any physical or chemical means. (b) Copper, iron, gold, hydrogen, oxygen, nitrogen and chlorine are examples of elements. (c) Element term “element” was first used by Robert Boyle in 1661. | |||
| Right Option : D | |||
| View Explanation | |||
The term “element” was first used by _________________ in 1661. | |||
| Right Option : C | |||
| View Explanation | |||
Boron is a _________________ | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [20]
Abhyas 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
10thOne 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
10thMy experience with Abhyas Academy has been very good. When I was not in Abhyas whenever teacher ask questions I could not speak it confidently but when I came in Abhyas, my speaking skills developed and now I am the first one to give the answer of teachers question.
Upmanyu Sharma
7thAbhyas academy is great place to learn. I have learnt a lot here they have finished my fear of not answering.It has created a habit of self studying in me.The teachers here are very supportive and helpful. Earlier my maths and science was good but now it has been much better than before.
Barkha Arora
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
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
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
8thAbhyas is an institute of high repute. Yogansh has taken admission last year. It creates abilities in child to prepare for competitive exams. Students are motivated by living prizes on basis of performance in Abhyas exams. He is satisfied with institute.
Yogansh Nyasi
7thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thAbout 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
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
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
8thWhen I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
Sharandeep Singh
7thIt 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
10thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thWe started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
Manya
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...
Aman Kumar Shrivastava
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
8thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
