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physical science chap 17 vocal

Terms in this set (25)

atom
the smallest piece of matter still retains the property of the element
nucleus
is where protons and neutrons are found in small positively charged center
protons
are particles with an electrical charge of 1+
neutrons
neutral particles that do not have any charge
electrons
particles with an electrical charge of 1-
quarks
protons and neutrons are made up of smaller particles called
electron cloud
the area around the nucleus of an atom where its elections are found
atomic number
the number of protons in an atom
mass number
the sum of the number of protons and the number of neutrons in the nucleus of an atom
isotopes
atoms of the same element that have different numbers of neutrons
average atomic mass
the weighted average mass of the mixture of its isotopes
periodic table
elements are arranged by increasing atomic number and by change in physical and chemical properties
groups
vertical column in periodic table
electron dot diagram
uses the symbol of the element and dots to represent the electron in the outer energy level
periods
horizontal rows of elements on periodic table
atomic mass unit
The unit of measurement used for atomic particles is
number
In the periodic table, elements are arranged by increasing atomic
Dmitri Mendeleev
Who developed the early periodic chart?
protons
Electrons have very little mass compared to ?
6 protons
how many atoms due carbons have to have
They have complete outer energy levels
Explain why elements in group 18 are stable
Transition elements
Elements in the middle of the periodic table 3-12 are called?
G.N. Lewis
Who created the electron dot diagram?
6
How many electrons does Sulfur have on electron dot diagram?
Henry Moseley
Who created the modern version of the periodic table by atomic number?
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