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Class 10 Lessons
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Post a LessonAnswered on 20 Sep Learn CBSE/Class 10/Social Studies
Rashmi P.
Answered on 29 Oct Learn CBSE/Class 10/Science
Sheezan Naseer Bhat
Student doing Engineering who have experience of 2 years of taking tuitions of Mathematics.
ATOMIC NUMBER IS EQUAL TO NUMBER OF PROTONS PRESENT IN ITS NUCLEUS.
ATOMIC NUMBER IS DENOTED BY Z.
FOR H-ATOM,Z=1
FOR He-ATOM,Z=2
FOR Na-ATOM,Z=11
--->For different elements,the value of Z is different.
--->Z is also equal to the no. of electrons in an atom but it is not always true because in case of ions(anions and cations)the no. of electrons are not equal to no. of protons.
Answered on 03 Oct Learn CBSE/Class 10/Mathematics/UNIT IV: Geometry/Constructions
Concept Classes
1) Draw the circle of radius 6cm with center O
2) Draw a radius and extend it outside till P such that OP = 10cm
3) Draw a perpendicular bisector on OP to intersect at M
4) With OM or OP as radius, draw a circle with center M to intersect the previous circle at A and B
5) Join PA and PB
PA and PB are the required tangents.
read lessAnswered on 03 Oct Learn CBSE/Class 10/Mathematics/UNIT IV: Geometry/Constructions
Concept Classes
1) Draw the circle using the bangle
a) Draw 2 chords inside the circle and then draw their perpendicular bisectors to intersect at O
b) O is the center of the circle
2) Draw a radius and extend it outside till P(from where you want to draw the tangents)
3) Draw a perpendicular bisector on OP to intersect at M
4) With OM or OP as radius, draw a circle with center M to intersect the previous circle at A and B
5) Join PA and PB
PA and PB are the required tangents.
Feel free to reach out for any clarification.
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