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a group of metallic elements that have two electrons in their outer shells and react easily with other elements. Group 2 in the periodic table.
shows the structure of the molecule but not all the bonds between every atom.
a relative measure of the mass contribution of each component in a compound. The percentage...
the stratosphere extends from a height of 10 km to 50 km above the surface of the Earth.
the electrons in the outermost occupied shell of an atom.
a halogen atom (F, Cl, Br or I) reacts by addition reaction with alkenes