___ is the number of shells for elements of the 3rd period.
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Factors that may influence enzyme activity?
Which of the following statements are CORRECT?
I. Esters are sweet smelling substance.II Esters are used in making perfumes.III. Functional group of ester is R-O-RꞋ.
What is the position of metallic ion and non-metallic ion in a chemical formula?
Isobars are atoms of different chemical elements that have ______.
Atmosphere of Venus mostly contains which of the following gases?
What is formed when helium atom loses one electron?
Which group in the modern periodic table contains elements that are inert gases?