Chemistry class 9 | valance electron

Valancy & Valance electrons

The characteristic X-ray radiation is emitted when A. the bombarding electrons knock out electrons from the inner shell of the target atoms and one of the outer electrons falls into this vacancy B. the valance electrons are removed from the target atoms as a result of the collision C. the source of electrons emits a mono energetic bean D. the electrons are accelerated to a fixed energy

Chemistry final tips

A group of 24 students was polled as to whether they enoy biology class, chemistry class, both , or neither The results are shown in the table below: Given the above data, which of the following conclusions is true?

In a class of 55 students, the number of students studying different subjects are 23 in Mathematics, 24 in Physics, 19 in Chemistry, 12 in Mathematics and Physics, 9 in Mathematics and Chemistry, 7 in Physics and Chemistry and 4 in all the three subjects. Find the number of students who have taken exactly one subject.

Chemistry in Everyday life

Curved arrows are used in Organic Chemistry to show the moment of electrons in the mechanism of a reaction . The correct product of the following rection is

Green chemistry means such reactions which

Green chemistry means such reactions which

Green chemistry means such reactions which