Multiple Choice
Which Group 15 element is classified as a metal?
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4. Atoms and Elements
Periodic Table: Classifications
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Which of the following elements is classified as a nonmetal and is a solid at STP?
A
Neutherfordium (Rf)
B
Neon (Ne)
C
Chlorine (Cl)
D
Carbon (C)
Verified step by step guidance1
Understand the classification of elements into metals, nonmetals, and metalloids based on their properties such as conductivity, malleability, and appearance.
Recall that STP (Standard Temperature and Pressure) refers to a temperature of 0°C (273 K) and a pressure of 1 atm, and consider the physical state of elements under these conditions.
Review the given elements: Rutherfordium (Rf) is a metal, Neon (Ne) is a noble gas and a gas at STP, Chlorine (Cl) is a nonmetal but exists as a gas at STP, and Carbon (C) is a nonmetal that is solid at STP.
Identify that the element which is both a nonmetal and solid at STP must have properties consistent with nonmetals and be in the solid phase under standard conditions.
Conclude that Carbon (C) fits both criteria as a nonmetal and solid at STP, making it the correct choice.
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