Gizmo Element Builder

The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown here: ⁷Li

• 2 neutrons

• 13 neutrons

• 4 neutrons

• 7 neutrons

The atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown: ¹⁹F^1-

• 8 electrons

• 9 electrons

• 10 electrons

• 20 electrons

An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atomic mass, and net charge?

• atomic number = 26, atomic mass = 56, net charge = 3+

• atomic number = 26, atomic mass = 56, net charge = 3-

• atomic number = 30, atomic mass = 56, net charge = 3+

• atomic number = 56, atomic mass = 26, net charge = 3-

A lithium atom contains 3 protons, 4 neutrons and 3 electrons. What would be formed if one proton is added to this atom?

• a lithium ion

• a different isotope of lithium

• a beryllium ion

• a neutral atom of beryllium