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100
This famous French chemist discovered and named the element Oxygen(O).

Who is Antoine Lavoisier?

100

This is the change in state from a liquid to a solid.

What is freezing?

100

When matter transitions from the gas to the liquid phase, it is accompanied by this change in thermal energy.  

What is a decrease in thermal energy?

100

This is the SI unit for atomic mass.

What is the atomic mass unit (amu)?
100

This is the change in state from a gas to a liquid.

What is condensation?

200

Describe the arrangement of particles in a solid.

What is closely packed and fixed, yet able to vibrate?

200

Describe the arrangement of particles in a gas.

What is widely spread apart and moving rapidly?

200

Describe the arrangement of particles in a liquid.

What is loosely packed and able to move or flow.
200

This is a change in state directly from a solid to a gas.

What is sublimation?

200

This type of vaporization occurs only at the surface of a substance.

What is evaporation?

300

He first proposed and discovered the existence of negatively charged particles called "electrons".

Who is J.J. Thomson?

300

Discovering the neutron in 1932 made this scientist famous.

Who is James Chadwick?

300

This scientist was famous for claiming that all atoms of the same element are exactly alike and have the same masses.

Who is John Dalton?

300

This defined as "the overall energy of motion of particles in a substance"

What is thermal energy?

300
This scientist first claimed that all matter was composed of small uncuttable pieces called "atomos".

Who is Democritus?

400

This radioactive particle contains only a high speed electron.

What is a beta particle?

400
This is the number of neutrons in the isotope Plutonium-239.

What is 145?

400

Consider the isotope Iodine-131, this is the number of neutrons contained in its nucleus. 

What is 78?

400

This radioactive particle contains 2 protons and 2 neutrons.

What is an alpha particle?

400

This is the number of protons in the nucleus of an atom of Astatine(At).

What is 85?

500
The isotope Hydrogen-3 is often referred to as:

What is tritium?

500

Antoine Lavoisier attended this prestigious college, earning a degree in law.

What is College of Mazarin?

500

This was the organization Lavoisier bought stake in, that ultimately led to his trial and death in the French Revolution.

What is the General Farm?

500

This is the number of protons and neutrons are in the isotope Cobalt-60.

What is 27 protons and 33 neutrons?

500

This was a fictional element many early chemists believed was responsible for combustion reactions.

What is phlogiston?