Electrons are positioned:
Mass Number is defined as:
An atom can be considered as consisting mostly of:
The number of known isotopes is roughly:
Atomic Number is defined as:
The radius of a nucleus is how much smaller than that of an atom:
For an atom to be electrically neutral, the number of:
Nuclear binding energies are usually expressed in units of:
The Hydrogen-3 nucleus (also called Tritium) consists of:
Isotopes are nuclei with:
Radioactivity is the process of:
The number of protons in a nucleus is expressed by the symbol:
How many neutrons are in a Uranium-235 nucleus?
The two main parts of an atom are called:
Which of the following is the smallest?
Which one of the following is a nucleon?
One Atomic Mass Unit is about:
In the symbol Cs-137, the number 137 represents: