The Atomic Model

Quantum

A fixed amount.

Photon

Fixed amounts of energy in light.

Valence Electrons

Electrons in the outermost shell of the atom, capable of taking part in chemical reactions.

Ground State

Lowest energy position of an electron in an atom.

Quarks

Particles that make up neutrons and protons, classified as colors and flavors.

Orbital

The area around the nucleus of an atom where the probability of finding an electron is greatest.

Atomic Mass

The mass of the protons plus the mass of the neutrons in the nucleus of an atom.

Atomic Number

The number of protons in the nucleus of an atom.

Select all if the statements that are true. a. each orbit holds a fixed number of electrons b. the n = 1 orbit can only hold two electrons c. each orbit can hold an unlimited numbet of electrons d. each orbit is limited to a maximum of four electrons

a. each orbit holds a fixed number of electrons. b. the n = 1 orbit can only hold two electrons.

Select all of the statements that are true. a. electrons are located in shells or orbits around the atom b. electrons orbit slowly around the atom c. electrons travel in one flat path around the nucleus of an atom d. electrons are traveling so fast that it is impossible to know their exact locations

a. electrons are located in shells or orbits around the atom. d. electrons are traveling so fast that it is impossible to know their exact locations.

Select all that apply. Quarks are thought to be the basic component of ___. a. protons b. electrons c. neutrons

a. protons c. neutrons

The atomic number of an element is equal to the number of ___ contained in one atom if that element. a. protons b. neutrons c. electrons d. protons and neutrons

a. protons.

Select all of the following that are particles of atoms. a. protons b. neutrons c. electrons d. quarks

a. protons. b. neutrons. c. electrons. d. quarks.

Bohr found experimental evidence for his atomic model by studying ____. a. the electron cloud b. line spectra c. quarks d. atomic mass

b. line spectra.

Bohr's model of the atom included a positively charged ______ orbited by negatively charged ______. a. nucleus, protons b. nucleus, electrons c. neutrons, electrons d. protons, electrons

b. nucleus, electrons.

Which of the following particles has almost no mass? a. proton b. neutron c. electron

c. electron.

The atomic mass of an atom equals the sum of the masses of the ____. a. protons and electrons b. electrons and neutrons c. protons and neutrons d. protons only

c. protons and neutrons.

An atom has no electrical charge because ___. a. the number of protons is equal to the number of neutrons b. the number of neutrons is equal to the number of electrons c. the number of protons is equal to the number of electrons

c. the number of protons is equal to the number of electrons.

Electrons in the outer shell are called ___. a. stable electrons b. unstable electrons c. valence electrons

c. valence electrons.