1) the only liquid metal in the modern periodic table a) Mercery b) bromine 2) the scientist who arranged elements in ascending order according to atomic number a) Mandeleev b) Mosely 3) all elements in group 1A are metal except  a) Lithium b) Hydrogen  4) the chemical activity of non metal........ with increasing the atomic number  a) decrease b) increase 5) The element Ne is in group a) zero group b) 1A

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