Question

vocabulary skills: expanding definitions
write five facts about the term nucleus, using the following words as cues.

1. size - nucleus is big for size of an atom
2. location - the location of the nucleus is in the center
3. rutherford - rutherford created the idea of the nucleus
4. charge
5. density

subatomic particles: reviewing the main ideas
complete the following chart

particle	location	mass (amu)	charge
electron	orbit	0.000549	-1
neutron	nucleus	1.008701	0

Explanation:

Step1: Define size fact

The nucleus is extremely small compared to the size of the atom, but contains most of the atom's mass. So, "The nucleus is tiny yet contains most of an atom's mass."

Step2: Define charge fact

The nucleus is positively - charged due to the presence of protons. So, "The nucleus has a positive charge because of protons."

Step3: Define density fact

The nucleus has an extremely high density. So, "The nucleus has a very high density due to tightly - packed protons and neutrons."

Answer:

1. The nucleus is tiny yet contains most of an atom's mass.
2. The location of the nucleus is in the center of the atom.
3. Rutherford created the idea of the nucleus.
4. The nucleus has a positive charge because of protons.
5. The nucleus has a very high density due to tightly - packed protons and neutrons.