Q35 of 63 Page 113

A picnic was planned for Class IX students to an amusement park. A chemistry teacher who accompanied the students instructed them to go for a ride as follows: Only two students could go for a first ride. Second ride could accommodate eight students. Third ride could accommodate remaining seven students.

Read the above passage and answer the questions that follows:


(i) The above situation can be compared with the structure of an element. name that element.


(ii) Is this element metal or non-metal? What is its valency?


(iii) What are the values associated with the students?

(i) The situation can be compared with the element Chlorine. Chlorine has the atomic number of 17 which has the same electronic configuration as the situation presented in the question.


(ii) The element is a non-metal and has a valency of 1.


(iii) Values associated with the students are of discipline and obedience towards the teacher and patience to wait for their turn for the ride.


More from this chapter

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33

(i) Draw the atomic structures of the following elements: Magnesium, silicon, sulphur.

(ii) What is the atomic number and mass number of the element whose atomic structure is shown in below?


 34

Areeba’s younger brother is suffering from dehydration. To combat dehydration she suggested him to take non-alcoholic drink like coconut water, barley water, sugarcane juice, glucose water etc., in plenty. Every cell in out body needs water in order to function properly as out body contains about 70% of water.

Read the above passage and answer the questions that follows:


(i) Name the elements present in water.


(ii) Write electronic configuration of both the elements.


(iii) How will you make children aware of taking sufficient amount to liquids and water to prevent dehydration?

 1

In the Thomson’s model of the atom, which of the following statements are correct?

(i) The mass of the atom is assumed to be uniformly distributed over the atom.


(ii) The positive charge is assumed to be uniformly distributed over the atom.


(iii) The electrons are uniformly distributed in the positively charged sphere.


(iv) The electrons attract each other to stabilize the atom.


Options || A. (i), (ii) and (iii)


B. (i) and (iii)


C. (i) and (iv)


D. (i), (iii) and (iv)

 2

Which of the following statements about Rutherford’s model of an atom are correct?

(i) Considered the nucleus are positively charged.


(ii) Established that the α-particles are four times as heavy as a hydrogen atom.


(iii) Can be compared to solar system.


(iv) Was in agreement with Thomson’s model.


Options || A. (i) and (iii)


B. (ii) and (iii)


C. (i) and (iv)


D. Only (i)