Name two elements in the modern periodic table that break Mendeléey's rule that the elements should be arranged in order of relative atomic mass. PLEASE I NEED THE ANSWER !

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.