Atomic Models
What was Thomson's Model?
atoms had negatively charged particles set in a positive sphere
What three particles are found in atom and which of them are in the nucleus?
Electrons, protons, and neutrons. Protons and neutrons are found in the nucleus.
Who created the periodic table and how did he order it?
What are the physical proprties of metals?
Malleable, luster, ductile, thermal conductivity, electrical conductivty
What are the properties of nonmetals?
poor conductors of electric current and heat, usually dull and brittle
What is Rutherford's model?
an atom was mostly empty space with a positive charge
Explain why Scientists use models to study atoms?
Atoms themselves are too small to study?
How is the modern periodic table arranged?
By atomic number
What are chemical properties of metals?
reactivity and corrosion
What happens when two nonmetals bond? What happens when a metal and nonmetal bond?
When nonmetals bond they share or gain electrons.
When metals and nonmetals bond they gain electrons.
What was Bohr's model?
he suggested that electrons move only in specific orbits around the nucleus of an atom
Which two atoms in a particle are equal in number?
protons and electrons
What information does the periodic table contain?
Atomic Number, Chemical symbol, Name of element, Atomic mass
How are metals classified?
alkali metals: Group 1
alkaline Earth Metals: Group 2
transition metals: group 3-12
mixed metals: groups 13-16
What are the families containing Nonmetals?
Carbon: Group 14
The Nitrogen Family: Group 15
The Oxygen Family: Group 16
The Halogen Family: Group 17
The Noble Gases: Group 18
What is the Cloud Model?
Electrons move rapidly within a cloudlike region around the nucleus
How are elements identified in terms of their atoms?
by their atomic number
Mendleev's table was organized by atomic mass and not an atomic number.
What is the most reactive group of metals?
alkali metals
Hydrogen is...
the simplest atom
What is the modern model of the atom?
At the center of the atom is a tiny, dense nucleus containing protons and neutrons. Surrounding the nucleus is a cloudlike region of moving electrons.
What two particles account for almost all the mass of an atom?
protons and neutrons
The periodic table is also organized in...
periods: rows
groups: columns
All transition metals are solids at room temperature except for...
mercury
What are some properties of metalloids?
solids at room temperature, good conductors of electric current, brittle hard and somewhat reactive.