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Chapter 2: Problem 64

Of the 114 -elements known, only two are liquids at room temperature \(\left(25^{\circ} \mathrm{C}\right)\). What are they? (Hint: One element is a familiar metal and the other element is in Group 7A.)

Short Answer

Expert verified
The two elements which are liquid at room temperature are Mercury (Hg) and Bromine (Br).

Step by step solution

01

Identify the metal that is liquid at room temperature

Among known elements, only two metals, Mercury (Hg) and Bromine (Br) are liquid at room temperature. Mercury is the only metal which is liquid at room temperature.
02

Identify the Group 7A element that is liquid at room temperature

Group 7A consists of elements known as the Halogens. Only one Halogen, Bromine (Br), is liquid at room temperature.

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Most popular questions from this chapter

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 \(8 \mathrm{~A} .)\)

Fluorine reacts with hydrogen \((\mathrm{H})\) and with deuterium (D) to form hydrogen fluoride (HF) and deuterium fluoride (DF) [deuterium \(\left({ }_{1}^{2} \mathrm{H}\right.\) ) is an isotope of hydrogen]. Would a given amount of fluorine react with different masses of the two hydrogen isotopes? Does this violate the law of definite proportions? Explain.

One isotope of a metallic element has a mass number of 65 and has 35 neutrons in the nucleus. The cation derived from the isotope has 28 electrons. Write the symbol for this cation.

A monatomic ion has a charge of +2 . The nucleus of the parent atom has a mass number of \(55 .\) If the number of neutrons in the nucleus is 1.2 times that of the number of protons, what is the name and symbol of the element?

Why is magnesium chloride \(\left(\mathrm{MgCl}_{2}\right)\) not called magnesium(II) chloride?
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