The mass of an element E found in 1.00 mole of each of four different compounds is 38.0 g, 57.0 g, 76.0 g and 114 g respectively .
An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet-like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure. (a) Name the element E. (b) What is allotrope A? (c) What is allotrope B? (d) What is allotrope C? (e) Which allotrope is used in making jewellery? (f) Which allotrope is used in making the anode of a dry cell?
An atom of element E contains 3 protons, 3 electrons and 4 neutrons: (a) What is its atomic number? (b) What is its mass number? (c) Write the electronic configuration of the element E. (d) State whether element E is a metal or non-metal. Why? (e) What type of ion, cation or anion, will be formed by an atom of element E? Why? (f) Write the symbol of the ion formed by an atom of element E. (g) What could element E be?