1. Name______________ period_____ Jefferson Lab
When was the nucleus discovered?
What are protons made of?
When were neutrons discovered? What are neutrons made of?
How many electrons weigh the same as a proton or neutron?
ChemicalElements.com
Find the following information for 3 elements with less than 20 protons.
Draw the structure diagram for the element.
Name: Symbol: Atomic Number: Atomic Mass: amu Melting Point: ｡C Boiling Point: ｡C Number of Protons/Electrons: Number of Neutrons: Classification: Crystal Structure: 293 K: g/cm3 Color: Date of Discovery: Discoverer: Name Origin: Uses: Obtained From:

2. WebElements.com Find the following information for 3 elementswith less than 20 protons Name: Symbol: Atomic Number: Atomic Mass: amu Melting Point: ｡C Boiling Point: ｡C Number of Protons/Electrons: Number of Neutrons: Classification: Crystal Structure: 293 K: g/cm3 Color: Date of Discovery: Discoverer: Name Origin: Uses: Obtained From:
Name: Symbol: Atomic Number: Atomic Mass: amu Melting Point: ｡C Boiling Point: ｡C Number of Protons/Electrons: Number of Neutrons: Classification: Crystal Structure: 293 K: g/cm3 Color: Date of Discovery: Discoverer: Name Origin: Uses: Obtained From: