PS Chapter 14

The tiny core of an atom containing most of the mass of the atom.

The radioactive decay of an atom resulting in the decrease of its atomic number.

A neutral particle with nearly the same mass as a proton.

An atom of this element has how many valence electrons?

The sum of protons plus neutrons in the nucleus of an atom

Theory that describes matter and energy at very small (atomic) sizes

Almost all the light we see comes from which source

What will two negative charges do to each other?

What do you call the nucleus of an atom that breaks up and emits particles of pure energy.

Forces of attraction between the particles in the nucleus

During beta decay the atom ejects

The number of protons in an atom.

The specific color of light emitted by an electron corresponds to the

Rutherford assumed atoms had a lot of empty space because alpha particles 

What is the charge of the nucleus of an atom?

The number of electrons that may be held in the third energy level of an atom.

An unstable electron

Weakest of the forces of nature

The radioactive decay of an atom resulting in the emission of energy

Atoms having the same atomic number but different mass numbers.

The radioactive decay of an atom resulting from the splitting of a neutron.

An elementary charge is represented by what symbol?

Released when an electron moves from a energy level to a lower level

Smallest unit of electric charge in matter.

Which atom particle is responsible for chemical properties

Forces of attraction between protons and electrons

How many energy levels would be completely filled by an atom of this element?

The unique characteristic pattern of colors each element can emit.

The number of protons to the number of electrons in a neutral atom

A subatomic particle's position, momentum, energy, and time can never be known simultaneously