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P.S. Test Ch. 4

QuestionAnswer
Dalton's atomic theory was accepted because... there was evidence to support it.
Atoms have no electric charge because they... have an equal number of electrons and protons.
Democritus's original atomic theory was revised because it... did not have a scientific basis.
Which of these statements is not part of Dalton's atomic theory? Atoms are made of electrons.
A subatomic particle that has a negative charge is called a(n)... electron.
Who determined that atoms could be divided? Thomson.
Thomson made his discovery about the atom during an experiment using... cathode rays.
Thomson is responsible for discovering that an atom contains... electrons.
What are the charges for the following subatomic particles? 1.) Proton 2.) Neutron 3.) Electron 1.) Positive 2.) Neutral 3.) Negative
In a ____atomic model, negative electrons orbit the positively charged nucleus. Rutherford's
What is an atom's nucleus made of? Protons and neutrons.
Whose model determined that an atom's positive charge is concentrated in the atom's center? Rutherford's.
The charge of an atom is... Why? Neutral, because an atom has the same amount of electrons, negatively charged, and protons, positively charged, so they cancel each other out.
An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have? 30.
How do you find mass? How do you find the number of neutrons? Mass #= protons+neutrons Neutrons= mass #-protons
An element's atomic number is equal to its number of... protons and electrons.
Two different isotopes of an element have different... electrons and mass.
What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons? 39.
Dalton's atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element are alike, and... atoms of different elements could form to join compounds.
Which statement about the atom's nucleus is correct? The nucleus is made of protons and neutrons and has a positive charge.
Which statement is true according to Dalton's theory? Atoms of the same element are exactly alike.
The word atom comes from a Greek word that means "unable to be ____________" cut or divided.
The first person who suggested that matter was made up of atoms was the Greek philosopher ___________. Democritus.
John Dalton's atomic theory stated that atoms of the same ______ are exactly alike. element
Most atoms have equal numbers of _______ and _______. protons;electrons.
The first theory of atoms, proposed by ______ and ________ units that could not be divided. Democritus;Dalton.
The nucleus of an atom has a(n) _______ electric charge. positive.
Isotopes of an element have the same atomic ______ but different atomic ______. number;mass
Thomson's study of cathode rays revealed that atoms contained negatively charged particles called ________. electrons.
Thomson's cathode-ray tube experiment supported the theory that _______ existed in an atom. electrons.
Rutherford's gold-foil experiment revealed that an atom's positive charge is concentrated in the atom's _______. nucleus.
Created by: OliviaRoark
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