Discovery of New Elements and Superheavy Elements
Chemistry ⇒ Atomic Structure and the Periodic Table
Discovery of New Elements and Superheavy Elements starts at 11 and continues till grade 12.
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Describe one challenge faced in the synthesis of superheavy elements.
Describe the difference between transuranium and superheavy elements.
Describe the general trend in half-lives of elements as atomic number increases beyond uranium.
Describe the role of neutron number in the stability of superheavy nuclei.
Describe the role of particle accelerators in the discovery of new elements.
Explain the importance of international collaboration in the discovery of new elements.
A research team synthesizes a new element with atomic number 119 by bombarding a berkelium-249 target with titanium-50 ions. Write the nuclear equation for this reaction and identify the product and any emitted particles.
Consider the following scenario: Scientists attempt to synthesize element 120 by bombarding a curium-248 target with a chromium-54 ion. If the reaction produces three neutrons, what is the mass number of the newly formed element 120 isotope?
Which element was named in honor of a famous Russian physicist?
(1) Nihonium
(2) Moscovium
(3) Livermorium
(4) Tennessine
Which of the following is a challenge in confirming the discovery of a new element?
(1) Producing enough atoms for study
(2) Measuring the atomic mass accurately
(3) Reproducibility of results
(4) All of the above
Which of the following is a property expected for superheavy elements?
(1) High natural abundance
(2) Long half-lives
(3) High instability
(4) Occurrence in living organisms
Which of the following is a reason why superheavy elements are not found in nature?
(1) They are too reactive
(2) They have extremely short half-lives
(3) They are formed only in stars
(4) They are gaseous at room temperature
Fill in the blank: Superheavy elements are generally defined as those with atomic numbers greater than ________.
Fill in the blank: The element with atomic number 113 is called ________.
Fill in the blank: The element with atomic number 114 is called ________.
Fill in the blank: The element with atomic number 116 is called ________.
True or False: All elements with atomic numbers greater than 92 are called transuranium elements.
True or False: All superheavy elements are found naturally on Earth.
True or False: Superheavy elements are expected to have similar chemical properties to lighter elements in the same group.
True or False: The discovery of new elements always leads to the discovery of new chemical properties.
