What is the difference between supplementary and complementary angles?

Supplementary angles are 2 angles that add up to a total of 180°

Complementary angles are 2 angles that add up to a total of 90°

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Supplementary angles are the angles that make a sum of 180˚.
Complementary angles are the angles that make a sum of 90˚ 

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table