Science 8 Ch. 3 Test Review

Early 1800s atomic scientist

• Democritus
• Dalton
• Rutherford

1st scientist to say "atoms contain smaller particles"

• Thomson
• Rutherford
• Bohr

Rutherford thought atoms were made mostly of _______

• empty space
• positively charged material
• electrons

Rutherford's model of the atom included

• a small central core
• positively charged material
• energy levels

Niels Bohr said that electrons _________

• do not exist
• orbit the nucleus
• are inside the nucleus

If an electron gets enough energy it ______

• falls to a lower energy level
• jumps to a higher energy level
• sparkles

The atomic mass number is equal to the number of ____

• protons and neutrons
• protons
• protons and electrons

"amu" stands for

• atomic measuring unit
• alternate mass unit
• atomic mass unit
• atomic matter unit

Tritium is an _____

• electron energy level
• isotope of hydrogen
• element with atomic number 102
• isotope of carbon

______ constructed the first periodic table of elements

• Dalton
• Thomson
• Henry Mosely