Consider the following statements about the periodic table of chemical elements 1. The ionization potential gradually decreases along a periodicity. 2. In a group of elements, as the atomic mass increases, the electron affinity decreases. 3. Electronegativity decreases as the atomic number increases in a given periodicity. Which of the above statement(s) is/are correct?

Consider the following statements about the periodic table of chemical

1.	Consider the following statements about the periodic table of chemical elements 1. The ionization potential gradually decreases along a periodicity. 2. In a group of elements, as the atomic mass increases, the electron affinity decreases. 3. Electronegativity decreases as the atomic number increases in a given periodicity. Which of the above statement(s) is/are correct?
A.	only 1
B.	only 2
C.	1 and 3
D.	2 and 3
Answer» C. 1 and 3