2026 | Study Guide,
Practice QA & Exam
Review
|Graded A+ | Guaranteed
success|
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, Protons Positive Charge
found in the nucleus
Electrons Negative Charge
Found outside the nucleus
Atomic Number The number of protons and electrons in an atom
Atomic Structure Each atom has a Nucleus
Protons and Neutrons are found inside the Nucleus
Electrons found outside the Nucleus
Charges of Protons and Electrons Equal but opposite charges
Protons+Neutrons= Mass Number
Nuclide Symbol a shorthand way to indicate the element, its atomic number and its mass number
Other ways to identify the Mass Number cobalt-60
carbon-13
Isotopes Have the same atomic number but different mass numbers
Nuclear Charge the total charge of the nucleus of an element is equal to the atomic number of the
element
Stability of the Isotopes based on their ratio of neutrons to protons
Energy Levels can hold a certain maximum number of electrons