Boiling Point
The temperature at which an element turns from liquid to gas at standard pressure.
See boiling point colored on the interactive table →Across a period (left → right)
Follows roughly the same shape as melting point — peaks among the mid-transition metals, drops toward the nonmetals.
Down a group (top → bottom)
Varies by block, similarly to melting point.
Why it happens
Boiling point is governed by the same bonding strength that determines melting point — it takes more energy to fully separate atoms held together by strong metallic or covalent bonds than atoms (or molecules) held together only by weak intermolecular forces. Tungsten's boiling point (~5828 K) is the highest of any element; helium's (~4 K) is the lowest.
Like melting point, this trend is irregular — bonding type matters more than simple position on the table.