Final answer:
Tungsten typically forms a stronger metallic bond than sodium, lithium, and strontium due to its greater number of delocalized electrons and highly charged, small ions that effectively attract these electrons. So the correct option is B.
Step-by-step explanation:
The student is asking which metal would form a stronger metallic bond among sodium, tungsten, strontium, and lithium. A metallic bond involves the attraction between delocalized electrons, often referred to as a 'sea of electrons', and the positive ions of the metal. The strength of this bond is often influenced by the number of valence electrons that become delocalized and the charge of the metal ions, which correlates to the size of the ion and its ability to hold those electrons close.
Tungsten, being a transition metal, typically has more valence electrons available to delocalize and form metallic bonds compared to alkali and alkaline metals (such as sodium, lithium, and strontium). Consequently, tungsten generally forms stronger metallic bonds due to its greater number of delocalized electrons and the relatively small and highly charged nature of its ions which attract these electrons.