Pearson Chemistry Chapter 4: Atomic Structure
Terms in this set (39)
amu (atomic mass unit)
defined as one twelfth of the mass of a carbon-12 atom; also, the mass of a proton or neutron
the smallest particle of an element that retains its identity in a chemical reaction
atomic mass minus atomic number
How do you calculate the number of neutrons?
What on the periodic table indicates the number of protons?
Elements are composed of tiny particles called ________.
atoms are indivisible
What part of Dalton's atomic theory has been proved incorrect?
atoms are separated, joined, or rearranged
What happens to atoms in a chemical reaction?
a stream of electrons produced at the negative end of a tube containing a gas at low pressure
cathode ray tube
the piece of equipment that helped Thomson discover electrons
confirmed the existence of neutrons
Atoms of different elements can form _________ by combining in simple whole-number ratios.
an English chemist and schoolteacher who transformed Democritus ideas on atoms into a scientific theory by using experimental methods
________ atomic theory included the ideas: 1) Elements are composed of atoms, 2) Atoms of different elements are different, 3) Atoms of different elements can combine in simple whole-number rations to form compounds, and 4) Chemical reactions occur when atoms are separated, joined, or rearranged.
a Greek philosopher who was among the first to suggest the existence of atoms; believed they were indivisible and indestructible
Atoms of any one element are ________ from those of any other element.
negatively charged subatomic particle located outside the nucleus
Through his ________, John Dalton transformed Democritus' ideas on atoms into a scientific theory.
gold foil experiment
Which experiment did Rutherford do?
a vertical column on the periodic table
Atoms of the same element but with different numbers of neutrons from each other?
What on the periodic table indicates the total number of protons and neutrons?
What is the charge of an electron?
What is the charge of a neutron?
subatomic particle with no charge but with a mass equal to proton
In a chemical reaction are atoms of one element changed into atoms of another element?
the tiny central core of an atom composed of protons and neutrons; positively charged; where most of the mass is located
plum pudding model
What was Thomson's model of the atom called?
What is the charge of a proton?
positively charged subatomic particle located in the nucleus
proton, neutron, electron
name the 3 sub-atomic particles
protons and electrons
Which subatomic particles are equal in number to the atomic number?
protons and neutrons
Which particles mainly make up the atomic mass?
percentage of how often an isotope occurs in nature
Who discovered the nucleus as a result of the gold foil experiment?
scanning tunneling microscopes
Individual atoms can be seen with _______.
separated, joined, or rearranged
Chemical reactions occur when atoms are _______.
series or period
a horizontal row on the periodic table
simple whole numbers
Atoms of different elements chemically combine in what ratios to form compounds?
discovered the electron with the cathode ray tube experiment
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