The element having the highest atomic number and mass number is
AOganesson
BFlerovium
CMoscovium
DTennessine
Answer:
A. Oganesson
Read Explanation:
Oganesson (Og)
- Oganesson is a synthetic chemical element with the symbol Og and atomic number 118.
- It is the element with the highest atomic number (number of protons) and consequently the highest mass number (total number of protons and neutrons) currently known.
- As of its discovery, it was the last element in the 7th period of the periodic table.
- It is a transactinide element and belongs to Group 18, the noble gases. However, due to relativistic effects, its chemical properties are predicted to differ significantly from lighter noble gases, and it may not be a gas at standard conditions.
- The element was first synthesized in 2002 by a joint team of Russian and American scientists at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia.
- It was officially named Oganesson on November 28, 2016, in honor of the Russian nuclear physicist Yuri Oganessian, who made significant contributions to the discovery of superheavy elements.
- Oganesson is highly radioactive, and all its known isotopes have very short half-lives, decaying within milliseconds.
- Due to its extreme instability and the minute quantities produced, Oganesson has no known practical applications.
- The synthesis of Oganesson involves bombarding Californium-249 with Calcium-48 ions.
- It is considered a placeholder in the periodic table, and theoretical studies continue to explore the properties of elements beyond 118.