atom
smallest particle that can still be considered an element
electron
negatively charged particles
throughout
atoms have negatively charged particles _
chocolate chip cookie
what is an example of electrons in an atom?
nucleus
dense center
proton
positively charged particle
nucleus
positively charged particles are found in the _
specific
electrons move in _ orbits
fixed
each electron orbit has a _ energy
found in the nucleus
rutherford
positive
protons are:
found on outside of nucleus
thomson
negative
electrons are:
found in nucleus
chadwick
neutral
atomic mass-atomic number = neutrons
neutrons are:
atomic number
number of protons in an atom of an element
different
atoms of different elements have _ numbers of protons
neutral
because an atom is _ the atomic # also equals the number of electrons
mass number
the sum of protons and neutrons in an atom
isotopes
atoms of the same element that have different numbers of neutrons and different mass numbers
different
isotopes of an element have the same atomic # but _ mass #’s because they have different #’s of neutrons
protons= Ernest Rutherford; neutrons= James Chadwick
who discovered neutrons and who discovered protons?
+protons and -electrons *they are the same/equal
what 2 things can you determine from the atomic number?
false
true/false? all atoms in the environment are equal
Bohr’s Model
what model did Neil Bohr discover?
thomson
what scientist compared electrons in an atom to chocolate chip cookies?
true
true/false? each electron orbit hasa fixed energy level
dalton
who discovered atoms?
rutherford
what scientist theorized that atoms contained a dense center called a nucleus?
energy levels
the possible energies that electrons in an atom can have
electron cloud
visual model of the most likely locations for electrons in an atom
orbitals
region of space around a nucleus where electrons are most likely to be found
behave
electron clouds let us know how electrons _ in their orbitals
loses
an electron in an atom can move from one energy level to another when the atom gains or _ energy
2
8
18
32
what are the 4 numbers for the rings in a bohr’s model