T he periodic table of elements (often known simply as the periodic table) has been helping scientists with their work for a ...

The elements that make up each column of the periodic table share a set of common traits. Here, ... (N₂) makes up approximately 78 percent of the air we breathe.

To account for this, most periodic tables hive off the elements making up this f-block, putting it below the table, leaving a gap in group 3. Fair enough. But there is debate over which of the ...