Question

What is the trend of valency in a group?​

Answer 1

Explanation:

Valency in the periodic table across a period first increases and then decreases. There is no change going down a group. However, this periodic trend is sparsely followed for heavier elements (elements with atomic number greater than 20), especially for lanthanide and actinide series.

Answer 2

Answer:

$\frak{\:\underline{Valency \:in \:the \:periodic \:table \:across \:a \:period \:first \:increases \:and \:then \:decreases. \:There \:is \:no \:change \:going \:down\: a \:group. \:However, \:this \:periodic\: trend \:is \:sparsely \:followed\: for \:heavier \:elements\: (elements \:with \:atomic \:number \:greater\:than \:20), \:especially \:for \: lanthanide \: and \: actinide \:series.}}$