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studying atoms

QuestionAnswer
Democritus named the smallest particles of matter ________ because they could not be divided. Atoms
Four elements that Aristotle included in his model of matter. Fire, water, air, earth.
True or False- John Dalton gathered evidence for the existence of atoms by measuring the masses of elements that reacted to form compounds. TRUE!
what theory did Dalton propose to explain why the elements in a compound always joins in the same way? All matter is made up of individual particles called atoms.
Main points of Dalton's theory of atoms All elements are composed of atoms, in a particular compound atoms of different elements always combine the same way, compounds contain atoms of more than one element.
Objects with electric charges repel
objects with opposite electric charges attract
Thomson concluded that the particles in the glowing beam had a _______ charge because they were attracted to a positive plate. negative
true or false- Thomson's experiments provided the first evidence for the existence of subatomic particles. True
what is a alpha particle fast-moving particles that have a positive charge.
Rutherford concluded from the gold foil experiment. an atom's positive charge is concentrated in its nucleus.
three subatomic particles Protons, electrons, neutrons.
a subatomic particle with a positive charge. proton
why did Chadwick conclude that the particles produced by his experiment were neutral in charge. a charged object did not deflect their path.
properties that vary among subatomic particles Mass, Charge, Location in the atom
accurately compare the mass of neutrons and protons. mass of 1 neutron=mass of 1 proton
what is an atomic number element equals the number of protons in an atom of that element.
quantities that are always equal to an element's atomic number. number of protons
what is a mass number of an atom the sum of the protons and neutrons in the nucleus of that atom.
Number of neutrons Mass number - Atomic number
every atom of a given element has the same number of protons and electrons
every atom of a given element does not have the same number of neutrons
what are isotopes Atoms of the same element that have different number of neutrons and different mass number
all oxygen atoms have 8 protons. Neutrons in an atom of oxygen-18 10
water that contains hydrogen-2 atoms instead of hydrogen-1 atoms is called heavy water.
tells how Bohr's model of the atom differed from Rutherford's model Bohrs focused on the electrons.
what can happen to an electron in an atom when the atom gains or loses energy the energy of an electron can charge.
what evidence do scientists have that electrons can move from one energy level to another measured energy gained or loss
when trying to predict the location and motions of electrons in atoms, scientists must work with Probability
what is electron cloud visual model of the most likely location for electron in an atom.
an electron model is a good approximation of how electrons behave in their orbitals
higher energy levels have ______ orbitals lower energy levels do. more
relationship between the number of orbitals and the maximum number of electrons in an energy level. it's twice the number of orbitals.
what is an electron configuration arrangement of electrons in the orbitals of an atom
an excited state is less stable than a ground state. True.....
when all of the electrons in an atom are orbitals with the lowest possible energies. the electrons are in the most stable configuration, the atom is in its ground state.
Created by: Chelsea Belsea
 

 



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