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Chapter 2: Problem 66

List the elements that exist as gases at room temperature. (Hint: All except one element can be found in Groups \(5 \mathrm{~A}, 6 \mathrm{~A}, 7 \mathrm{~A},\) and \(8 \mathrm{~A} .)\)

Short Answer

Expert verified
The elements which exist as gases at room temperature are Hydrogen (H), Nitrogen (N), Oxygen (O), Fluorine (F), Chlorine (Cl), Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).

Step by step solution

01

Identify Elements in Groups 5A to 8A

Refer to the Periodic Table and identify the elements in Groups 5A to 8A. These groups primarily belong to the 'P block' of the table. Do remember that room temperature is traditionally considered to be 25 degrees Celsius or 77 degrees Fahrenheit.
02

List the Elements that Exist as Gases

From Groups 5A to 8A, identify the gaseous elements at room temperature, they are: Nitrogen (N), Oxygen (O), Fluorine (F), Chlorine (Cl), and the Noble Gases Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).
03

Consider the Exception

The hint mentioned an exception, which means there is one gaseous element not in these groups. Check the periodic table again for any remaining gaseous element. The answer is Hydrogen (H), which falls under Group 1A.

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Most popular questions from this chapter

Define molecular formula and empirical formula. What are the similarities and differences between the empirical formula and molecular formula of a compound?

What are the empirical formulas of the following compounds? (a) \(\mathrm{C}_{2} \mathrm{~N}_{2}\), (b) \(\mathrm{C}_{6} \mathrm{H}_{6}\) (c) \(\mathrm{C}_{9} \mathrm{H}_{20},\) (d) \(\mathrm{P}_{4} \mathrm{O}_{10},(\mathrm{e}) \mathrm{B}_{2} \mathrm{H}_{6}\)

What is an ionic compound? How is electrical neutrality maintained in an ionic compound?

What is wrong or ambiguous about these descriptions? (a) \(1 \mathrm{~g}\) of hydrogen, \((\mathrm{b})\) four molecules of \(\mathrm{NaCl}\).

Fill the blanks in the following table. $$\begin{array}{|c|c|c|c|}\hline \text { Cation } & \text { Anion } & \text { Formula } & \text { Name } \\\\\hline & & & \text { Magnesium bicarbonate } \\\\\hline & & \mathrm{Sr} \mathrm{Cl}_{2} & \\\\\hline \mathrm{Fe}^{3+} & \mathrm{NO}_{2}^{-} & & \\ \hline & & & \text { Manganese(II) chlorate } \\\\\hline & & \mathrm{SnBr}_{4} & \\\\\hline \mathrm{Co}^{2+} & \mathrm{PO}_{4}^{3-} & & \\\\\hline \mathrm{Hg}_{2}^{2+} & \mathrm{I}^{-} & & \\\\\hline & & \mathrm{Cu}_{2} \mathrm{CO}_{3} & \\\\\hline & & & \text { Lithium nitride } \\\\\hline \mathrm{Al}^{3+} & \mathrm{S}^{2-} & & \\\\\hline\end{array}$$
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