Atomic Theory

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

1. found in the nucleus
2. rutherford
3. positive
4. # of protons=atomic #

protons are:

1. found on outside of nucleus
2. thomson
3. negative
4. # of electrons=atomic #

electrons are:

1. found in nucleus
2. chadwick
3. neutral
4. 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

1. 2
2. 8
3. 18
4. 32

what are the 4 numbers for the rings in a bohr’s model