Contributions to modern atomic theory

An __________________ is the basic unit of a chemical element.

• atom

• molecule

• electron

• proton

atoms contain negatively charged _________ and positively charged protons, whereas neutrons have no charge.

Atoms are made up of three particles: protons, neutrons and ...

• quarks

• electrons

• orbits

• nucleous

The behavior of matter and light on the atomic and subatomic scale can be studied using quantum mechanics

• TRUE

• FALSE

Knowing how matter is structured can help us to determine how it’s going to behave in given conditions.

• TRUE

• FALSE

_______________ named the building blocks of matter atomos, meaning literally “indivisible,” about 430 BCE.

• Dalton

• Schrödinger

• Democritus

• Bohr

One of the postulates of the ____________'s atomic theory is that atoms cannot be created or destroyed.

• Dalton

• Schrödinger

• Democritus

• Bohr

Schrödinger's model describes the probability that an electron can be found in a region of space called ___________.

• orbit

• nucleus

• orbital

• atom

____________ incorporated the discovery of neutrons to Bohr atomic model

• Rutherford

• Chadwick

• Dalton

• Thomson

In the Bohr atomic model, electron orbits are associated with definite energies that are called energy levels or shells.

• TRUE

• FALSE