Phy Sci Unit 5 Studying Atoms

Question Answer
The smallest piece of matter that still retains the properties of the element Atom
Number on the periodic table that represents the number of protons in an atom Atomic Number
Number on the periodic table that is the weighted average mass of the mixture of isotopes that exists naturally for an element Average Atomic Mass
Showed through light spectroscopy that electrons existed in specific energy levels in 1913 Bohr
Father of modern atomic theory – showed with experiments in 1800 that all elements had atoms as their smallest particles Dalton
Ancient Greek who first said all matter was made of small indivisible particles called “atomos” Democritus
Region outside of the nucleus where the electrons are found Electron Cloud
Current atomic model with electrons not as particles in orbits, but wave-particles in areas of probability Electron Cloud Model
Negatively charged particles in an atom Electrons
Atoms of the same element that have different numbers of neutrons Isotopes
The sum of the number of protons plus neutrons in the nucleus Mass Number
Neutral particles in the nucleus of an atom Neutrons
The center of the atom containing protons and neutrons Nucleus
Positively charged particles in an atom Protons
Smallest known particle that makes up protons and neutrons Quarks
Discovered the positive nucleus at the center of atoms with gold foil experiment in 1911 Rutherford
Discovered electrons with cathode ray tube experiments in 1904 Thompson
Each energy level of an atom can hold a maximum number of what? electrons
The filling order for electrons in a Bohr diagram is 2,8,18,32
What do the dots in a Lewis Electron Dot diagrams represent? electrons in the outer level or valence electrons
What does the chemical symbol represent? the name of an element
The mass number of any element equals what? The protons + the neutrons
Where is the atomic number found? At the top of the element box
Why do different metals produce different colors when burned? Electrons are “excited” by added energy, and jump to another energy level. When they “fall back,” they release energy as light. The amount released determines the color seen.
How do you indicate a specific isotope of an element? By adding the mass number of that isotope (example: H-1, C-14)
How do we show protons, neutrons and electrons on a Bohr diagram? proton – p+; neutron – n; electron – e-; protons and neutrons in nucleus, electrons in energy levels
He discovered the neutron. James Chadwick
He believed that all matter was made up of earth, air, fire, and/or water. Aristotle
In an experiment, it is the variable that is being tested or manipulated. Independent variable
Calculate the mass number of a element with 6 protons, 6 electrons, and 6 neutrons. 12 Sum of protons and neutrons
Diagram or model showing an element symbol and dots representing the outermost electrons only. Lewis structure or diagram
Diagram showing particles in the nucleus and all electrons in their energy levels. Bohr model
How many electrons may reside in energy level 1 if it is full? 2
How many electrons may reside in energy level 2 if it is full? 8
How many electrons may reside in energy level 3 if it is full? 18
How many electrons may reside in energy level 4 if it is full? 32

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