"Grade 9" Exercise 12 The element sulfur (S) is situated just below oxygen in the periodic table. 1- Write the electron configuration of oxygen atom. 2- Indicate its location in the periodic table. 3- Deduce the position of the element sulfur "S" in the periodic table. 4- Write the electron configuration of sulfur atom "S". 5- Determine the atomic number of the element sulfur... Exercise: 13 "X" is an atom that belongs to the alkali metal family.. 1- Indicate the column of (X) in the periodic table. 2- Determine the number of electrons that "X" atom has in its outer most. energy level. 3- "X" atom has 3 shells; write its electron configuration. 4- Referring to the periodic table, identify "X". 5- Atom "E" has the same row as "X", but it has 8. electrons in its outer shell 5.1- Indicate the group of atom X. 5.2- Write its electron configuration. 5.3- Justify if "E" is a metal or a non metal? 2- Identify to which family does each of A, Y, E and D belong? Classify them into metals, non metals or metalloids. H Exercise: 14 Referring to document "1"to answer the following questions. Number of shells i 1- Write the electron configuration of A, B, Y, E and D. -5- Na K 4+ B 3+ 2+ 1+ A 123 4 5 Document 1 6 ED + 78 Number of et in the outer shell​