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