Which of these Period 3 elements has the highest melting point?0/1A AluminiumB PhosphorusC SodiumD Sulfur

The element with the highest melting point in Period 3 is Aluminium (A). Here's a step-by-step explanation:

1. First, let's understand what Period 3 elements are. The periodic table is divided into periods (horizontal rows) and groups (vertical columns). Period 3 elements are the elements in the third row of the periodic table. This includes the elements Sodium (Na), Magnesium (Mg), Aluminium (Al), Silicon (Si), Phosphorus (P), Sulfur (S), Chlorine (Cl), and Argon (Ar).

2. The melting point of an element is the temperature at which it changes from solid to liquid state. Different elements have different melting points due to the differences in the strength of the bonds that hold their atoms together.

3. Among the options given (Aluminium, Phosphorus, Sodium, and Sulfur), Aluminium has the highest melting point. The melting points of these elements are as follows: Aluminium - 660.32°C, Phosphorus - 44.15°C, Sodium - 97.72°C, and Sulfur - 115.21°C.

4. Therefore, Aluminium (A) has the highest melting point among the given Period 3 elements.