Name______________ period_____ Jefferson Lab http://education.jlab.org/atomtour/ 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: Density @ 293 K: g/cm3 Color: Date of Discovery: Discoverer: Name Origin: Uses: Obtained From:
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: Density @ 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: Density @ 293 K: g/cm3 Color: Date of Discovery: Discoverer: Name Origin: Uses: Obtained From: