Multiple Choice
Which of the following elements is NOT one of the eight most abundant elements in the Earth's crust?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following period 3 elements is least likely to react naturally under standard conditions?
A
Na
B
Al
C
Si
D
Ar
Verified step by step guidance1
Identify the elements listed and their positions in Period 3 of the periodic table: Na (Sodium), Al (Aluminum), Si (Silicon), and Ar (Argon).
Recall that reactivity generally depends on how easily an element can lose, gain, or share electrons to achieve a stable electron configuration.
Recognize that Na, Al, and Si are metals or metalloids that tend to react by losing or sharing electrons, making them relatively reactive under standard conditions.
Understand that Ar (Argon) is a noble gas with a full valence shell, which makes it very stable and unlikely to react naturally under standard conditions.
Conclude that among the given elements, Ar is the least likely to react because its electron configuration is already stable, explaining why it is chemically inert.
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