17 terms

Atomic Structure Highlights

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Negatively charged particles are referred to as
electrons
Atomic number of an element
the number of protons n the nucleus of an atom of that element
the number of protons determines what?
the identity of an element as well as many of its chemical and physical properties.
the sum of the protons and neutrons in the nucleus is
mass number that that particular atom.
The atom The nucleus is at the center and contains the protons and neutrons. The electron cloud is the region where you might find an electron and most of the volume of an atom.
has two regions and is 3 diminutional
The nucleus is at the...
the center and contains the protons and neutrons.
The electron cloud is
the region where you might find an electron and most of the volume of an atom.
The atom has a small, dense, positively charged central core called a
nucleus
Atoms of an element that are chemically alike but differ in mass are called
isotopes
Isotopes of an element have
different mass numbers because they have different numbers of neutrons but they all have the same atomic number.
The discovery of the isotope disproved who's theory? What does this theory state?
Daltons Theory; that all atoms of the same element are exactly alike.
*X
.X

*= Mass Number
.= Atomic Number
X= Element
Mass Number: number of protons and Neutrons
Atomic Number: number of protons
All matter is made of tiny indivisible particles called
atoms
Atomos of the same element are identical
those of different atoms are different

atoms of different elements combine in whole number rations to form compounds

Chemical reactions involve the rearrangement of atoms. No new atoms are created or destroyed
Dalton's atomic theory
Small subatomic particles found in nucleus, positive charge.
protons
Adding or removing protons from the nucleus of an atoms creates
a different element
Removing a proton from oxygen creates
nitrogen atom
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