a. List the noble gas elements. Which of the noble gases has only radioactive isotopes? (This situation is indicated

a. List the noble gas elements. Which of the noble gases has only radioactive isotopes? (This situation is indicated

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January 1, 2022
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a. List the noble gas elements. Which of the noble gases has only radioactive isotopes? (This situation is indicated on most periodic tables by parentheses around the mass of the element. See inside front cover.)

b. Which lanthanide element and which transition element have only radioactive isotopes?

Answer and ExplanationSolution by a verified expert

A

Explanation
Covalent compounds formed when two or more nonmetals combine with each other. These elements share electrons with each other in order to complete octet and form covalent bonds. Sulfur difluoride is a binary compound consisting of two nonmetals which are sulfur and fluorine. While naming, the first element in the chemical formula is written first in its natural form and second element can be written latter in its anionic form. In SF2, sulfur being first element written first in the naming as sulfur and fluorine being second element written at second place in the naming as its anionic form, which is fluoride. The prefix di- stands for two fluorine atoms in the compound. Sulphur has 6 electrons in its outer shell but in order to obey octet rule, it should have 2 more electrons so it combines with two more flourine atoms to become stable. Similarly, flourine requires one more electron to attain octet. hence each flourine atoms shares one electrons from sulphur and become stable.

Verified Answer
Sulfur difluoride

B

Explanation
f-block in the periodic table consists of two series of 14 elements each which are known as inner transition series. Lanthanides are the members of first transition series whereas the transition elements are the d-block elements, thus, having the valence electrons in the d-orbital. Radioactivity is the phenomenon in which an unstable atomic nucleus breaks down into stable one with release of some energy and particles and such atom is known to be radioactive in nature. Promethium belonging to lanthanides and technetium belonging to transition elements are two such examples.

Verified Answer
Lanthanide: Promethium (Pm)

Transition: Technetium (Tc).

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