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8th-Atoms & the PT

Atoms and subatomic particles, using the periodic table, and the history of PT

TermDefinition
Atomic Mass Same as Mass Number, the number of protons and neutrons in a single atom
Mass Number Same as Atomic Mass, the number of protons and neutrons in an atom
Atomic Weight The average of all isotopes' mass numbers (or atomic masses), used for isotopes
Atomic Number Number of protons (or electrons) in an atom
Protons They have a mass of 1 amu, are positively charged, and are located in the nucleus of an atom
Neutrons They have a mass of 1 amu, are neutrally charged, and are located in the nucleus of an atom
Electrons They have a mass of 1/1840 (~0) amu, are negatively charged, and are located in the electron cloud of an atom
Electron Cloud The "ring" that the electrons orbit the nucleus in
Neutrally Charged Atoms Have the same number of protons and electrons
Atom The smallest particle with characteristics of an element
Who created the chocolate chip model of the atom? Thompson
Who created the first atomic theory? Dalton
What is Dalton's atomic theory (4)? -All elements consist of undividable atoms -Chemical reactions cannot change an atom's element -Compounds are when atoms of different elements combine in a specific ratio -Atoms of the same element have the same mass
What was Bohr's theory? Theorized that electrons orbited the nucleus
What was the Cloud model? Theorized that electrons where in an electron cloud that hovered around the nucleus of an atom
Isotopes Atoms with the same number of protons (same element) but different numbers of neutrons (Oxygen-16, Oxygen-17, etc.)
Periodic Table Groups Numbered 1-18, consist of vertical rows
Periodic Table Periods Numbered 1-7, consist of horizontal rows
Periodic Table A table of the chemical elements organized by rows and columns in an organized method
How did Lavoisier order elements (PT)? Grouped elements by metals and nonmetals
Who grouped elements by metals and nonmetals? Lavoisier
How did Cannizzaro order elements (PT)? Organized elements by their properties (first) from their standard set of atomic weights
Who organized elements by their properties from their atomic weights? Cannizzaro
How did Moseley order elements (PT)? Organized elements by their atomic numbers
Who organized elements by their atomic numbers? Moseley
How did Dobereiner order elements (PT)? Organized elements in triads (groups of three) and by increasing order of atomic weight and analyzed the properties of the middle elements
Who organized elements in triads by increasing order of atomic weight and analyzed the properties of the middle elements? Dobereiner
How did Newlands order elements (PT)? First to organize elements in a periodic table with increasing order of atomic masses but left no room for undiscovered
Who was the first to organize elements in a periodic table with increasing order of atomic masses? Newlands
How did Mendeleev order elements (PT)? Left room for undiscovered elements when ordering by atomic weight; created the framework for the modern PT
Who ordered elements in the PT by atomic weight and created the framework for the modern PT? Mendeleev
How did Meyer order elements (PT)? Created a semi-usable PT that won universal recognition
Who created a PT that won universal recognition? Meyer
How did Seaborg order elements (PT)? Discovered many elements and developed the idea of placing lanthanides and actinides under the PT
Who developed the idea of placing lanthanides and actinides under the PT? Seaborg
What are metals like physically? They are shiny and solid
What are metals like chemically (conductivity)? Highly conductive (reactive)
What are nonmetals like physically? Gas or solid and have low densities
What are nonmetals like chemically (conductivity)? Poor conductors (nonreactive)
What are metalloids like physically? Brittle and solid (are in between metals and nonmetals)
What are metalloids like chemically (conductivity)? Average conductivity (kinda reactive)
Created by: Booklyn
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