If the atomic number of three element X, Y and Z are 3, 11 and 17 respectively. Which two elements will show similar chemical properties. Justify. Ans. X and Y will show similar chemical properties
Answer
Let’s look at the electronic configuration of all these elements
- Electronic configuration of X (3): 2,1
- Electronic configuration of Y (11): 2,8,1
- Electronic configuration of Z (17): 2,8,7
Elements having the same number of valence electrons, will have similar chemical properties.
Since both X and Y have 1 valence electron, they have similar chemical properties.
