Which of the following elements is least likely to react with other elements due to its low metallic character?

• A. Mg (Magnesium)
• B. Al (Aluminum)
• C. Na (Sodium)
• D. Ne (Neon)

Answer: (D)

Verified step by step guidance

1. Understand the concept of metallic character: Metallic character refers to how readily an element can lose electrons to form positive ions (cations). Elements with high metallic character tend to be more reactive metals, while those with low metallic character are less reactive and often nonmetals or noble gases.
2. Identify the elements given: Mg (Magnesium), Al (Aluminum), Na (Sodium), and Ne (Neon). Note that Ne (Neon) is a noble gas, which is not listed in the options but mentioned as the correct answer.
3. Recall the position of these elements in the periodic table: Na, Mg, and Al are metals located in the s- and p-blocks, and they have varying metallic characters, with Na being the most metallic and Al less so, but all are metals that tend to react by losing electrons.
4. Recognize that Neon (Ne) is a noble gas with a full valence shell, making it extremely stable and chemically inert. This means it has very low metallic character and is least likely to react with other elements.
5. Conclude that among the elements listed, Neon (Ne) is the least likely to react due to its low metallic character and stable electron configuration.