An element has its electronic configuration as 2, 8, 2. Now anwswer the following questions : With which of the following elements would this element resemble? (Atomic numbers are given in the brackets) N (7), Be (4), Ar (18), Cl (17)

An element has its electronic configuration as 2, 8, 2. Now anwswer th

1.	An element has its electronic configuration as 2, 8, 2. Now anwswer the following questions : With which of the following elements would this element resemble? (Atomic numbers are given in the brackets) N (7), Be (4), Ar (18), Cl (17)
Answer» Solution :The atomic number of the GIVEN element is 12 and thi s element is Magnesium which belongs togroup 2 and Period 3. E l ectronic configuration of Mg (12) = (2, 8, 2) Electronic configuration of N (7)= (2, 5) Electronic configuration of Be (4)= (2, 2) Electronic configuration of Ar (18) = (2, 8, 8) Electronic configuration of Cl (17) = (2, 8, 7) Number of va lence electrons in this element (Magnesium) is 2. Similarly the number of valence e lectron in Be is 2. As they have same number of valence electrons they belong to same group i.e. group 2 and will resemble in some of their PROPERTIES.