# Segment A: Atomic Models

In this segment, the students learn about different models of the atom, including Dalton’s model, Thomson’s model, Rutherford’s model, and the Bohr model.

## Segment A: Atomic Models

Segment A: Atomic Models

In this segment, the students learn about different models of the atom, including Dalton’s model, Thomson’s model, Rutherford’s model, and the Bohr model.

### Science

SC1

Obtain, evaluate, and communicate information about the use of the modern atomic theory and periodic law to explain the characteristics of atoms and elements.

SC1.a

Evaluate merits and limitations of different models of the atom in relation to relative size, charge, and position of protons, neutrons, and electrons in the atom.

SPS1

Obtain, evaluate, and communicate information from the Periodic Table to explain the relative properties of elements based on patterns of atomic structure.

SPS1.a

Develop and use models to compare and contrast the structure of atoms, ions and isotopes.

SPS1.b

Analyze and interpret data to determine trends of the following:

• Number of valence electrons
• Types of ions formed by main group elements
• Location and properties of metals, nonmetals, and metalloids
• Phases at room temperature
SPS1.c

Use the Periodic Table as a model to predict the above properties of main group elements.

S8P1

Obtain, evaluate, and communicate information about the structure and properties of matter.

S8P1.e

Develop models (e.g., atomic-level models, including drawings, and computer representations) by analyzing patterns within the periodic table that illustrate the structure, composition, and characteristics of atoms (protons, neutrons, and electrons) and simple molecules.

anion - a negatively charged ion.

atomic number - the number of protons in the nucleus of an atom.

atomic radius - the distance from the atom's nucleus to the outermost energy level.

average atomic mass - a weighted average of all of the isotopes of that element in the universe.

cation - a positively charged ion.

effective nuclear charge (Zsubeff) - the net positive charge experienced by the valence electrons from the nucleus.

electron - a tiny particle with a negative charge that is found outside the nucleus of an atom.

electron configuration - the order in which electrons are arranged in an atom.

electronegativity - the ability of an atom to attract additional electrons.

energy sublevel - a smaller part within a primary energy level.

excited state - an atom, ion or molecule with an electron in a higher than normal energy level than its ground state.

ground state - the lowest energy state within electron orbitals.

Hund's Rule - When placing electrons in equal energy orbitals, electrons should not be paired until each equal energy orbital contains one electron.

ion - an atom with a positive or negative charge.

ionization energy - the amount of energy required to remove one valence electron from an atom.

isotope - the same element with different numbers of neutrons.

model - a physical, conceptual, or mathematical representation of a real phenomenon whose purpose is to explain and predict the observed phenomenon.

orbital - a region of space around the nucleus of an atom where an electron is likely to be found.

Pauli exclusion principle - when an orbital holds two electrons, the electrons much have opposite spin.

quantum - a specific amount of energy that can be absorbed by an electron as it moves from ground state to excited state, or released by an electron as it falls from the excited state back to ground state.

subatomic- any smaller part of an atom such as a proton, neutron, or electron.

valence electrons - electrons on the outer-most energy level of any atom.

valence shell - the outer-most energy level of an electron.

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