ACTIVITY . 1 Match the parts of Musculo-Skeletal System in column A with its description and functions in column B
COLUL A
1. Sau
2. Femur
3. Humerus
4. Spine
5. Knee cap
COLUMN B
A long bone in the upper arm.
B. irregular shaped bone found in the head
C. bones at the back or vertebral column.
D. patella/bone between thigh and legs.
E. Long bones found in the thighs.

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.