Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which of these elements is a metal?

Answer Details

The element with atomic number 20 is a metal. Therefore, the answer is Z. Explanation: In the periodic table, elements are classified as metals or non-metals based on their properties. Metals are typically shiny, malleable, ductile, and good conductors of heat and electricity. Non-metals, on the other hand, are typically dull, brittle, and poor conductors of heat and electricity. Out of the four elements mentioned in the question, only element Z has an atomic number of 20, which corresponds to calcium in the periodic table. Calcium is a metal, so element Z must also be a metal. The other three elements have atomic numbers of 2, 6, and 16, which correspond to helium, carbon, and sulfur, respectively. All three of these elements are non-metals. Therefore, the answer is Z.