Question

Write a note about periodic trends and chemical reactivity.

Answer 1

• The group 1 elements are extremely reactive because these elements can lose one electron to form cation. Their ionization enthalpy is also least.
• The high reactivity of halogens is due to the ease with which these elements can gain an electron to form anion. Their electron gain enthalpy is most negative. 
• The elements at the extreme left (alkali) exhibit strong reducing behavior, whereas the elements at the extreme right (halogens) exhibit strong oxidizing behaviour. 
• The reactivity of elements at the center of the periodic table becomes low when compared with extreme right and left.