Question

6. An atom has electronic configuration 2,8,2 A. What is the atomic number of this element ? B. What is its valency? C. What is the name of element ? D. To which of the following elements would it be chemically similar ( Beryllium - 4 or Oxygen-8). Justify your answer. E. In which group it is placed in Modern periodic table.​

Answer 1

Answer:

A.20 B.2 C.calcium D.Beryllium will show similar chemical reactions as calcium. Since these elements belong to same group II and also have two electrons in their outermost shell like calcium. E.Group 2 Calcium was named after the Latin term calx meaning lime, and is a reactive silvery metallic element found in Group 2 of the periodic table.