The neutral atom of an isotope of which noble gas contains 75 neutrons and 54 electrons?
Which alkali metal has 11 protons and a mass number of 23?
What is the symbol for the ion with atomic number 55, mass number 133 and a 1+ charge?
Which isotope is represented by the nuclide symbol ?
The cation of which alkaline earth metal contains 138 neutrons and 86 electrons?
What is the symbol for the ion with mass number 31, 18 electrons and a charge?
An ion has the symbol .
How many protons does the ion contain?
How many neutrons does the ion contain?
How many electrons does the ion contain?
What is the symbol for the ion containing 54 electrons, 53 protons and 74 neutrons?
What is the symbol for the ion with a 3+ charge, containing 24 electrons and 30 neutrons?