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24 Cards in this Set

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Mixture can be broken down into ___________ and ____________.
homogeneous and hetrogeneous
What did the Greeks bring to the development of the atomic theory?
Greeks developed the concept of an atom and named the atom
Neils Bhor decided the electrons did what?
electrons orbited the neucleus in energy levels
Define atom
smallest units of matter that retains the properties of matter
What did John Dalton?
all elements made of small spherical shapes called atoms and atoms from one element differ from others.
Who invented the periodic table and how was the table arranged?
Demitri Mendleev and by atom mass numbers
Example of a element, compund and mixture.
oxygen, water, salad dressing
What did Thompson dicover?
atoms had a positive center with negativ electrons attached to it.
Why is group 18 called noble gases?
they won't bond with any other elements and they are all stable
How is the periodic tbale aranged today
atomic number
Name groups 1,2,3-12,17,18
1-Alkali metals 2-alkaline earth metals 3-12-transition elements 17-hatogens 18- noble gases
How many periods and groups are on the table?
7 periods and 18 groups
How does the group number help you draw dot models? How does the period number help you draw atom models?
valence electrons
amount of energy levels
Why does the periodic table give average atomic mass numbers?
because there might be an istope for that element
Define isotope and valence electrons
isotope-atoms of the same element with diff.#'s of neutrons.
valence electrons-outer most electrons
Substances can be broken down into __________ and ___________.
elements and compounds
Matter can be classified in what two ways?
a substance and mixture
What are the two types of chemical bonds and how can you tell the difference between the two?
ionic bond and covalent bond.
ionic bond is a transfer covalent bond is a share.
what is the area that electrons are in called?
electron cloud
which phose of matter has the least kenetic energy?__________
solida
In an ionic bond metals become ________ ions and the nonmetals becom _______ ions.
positive and negative
define ion
a positively or negatively charged atom
Rutford's gold foil experiment brought the discovery of what?
said an atom had empty space with a positive core called the neucleu surronded by electrons.
which phase of matter has the least knetic energy?
solids