Humility Review

JAMES CHADWICK
__________________________
discovered that atoms consisted not only
of protons and electrons but also
neutrons, a neutral subatomic particle that
has approximately the same mass as a
proton. Neutrons occupy the nucleus of
the atom.
According to
ARISTOTLE
_______________________,
everything on Earth is made of
the four elements: earth, fire,
water and air.
JOHN DALTON
___________________________ stated that matter is
divided by tiny, indivisible particle, which he called,
ATOMS
___________________________. His model is known as
BILLIARDorBALL
the ___________________________ the solid sphere
model. He proposed that every single atom of an element,
such as gold, is the same as every other atom of that
element. He also proposed that atoms of different elements
combine in fixed, whole-number ratios when forming
__________________________.
COMPOUNDS
LEUCIPPUS
___________________________ is described
as the founder of atomism, the theory that all
things are made up of atoms. His theory stated
that matter is homogeneous but consists of an
infinity of small indivisible particles.
DEMOCRITUS
His student, ___________________________ came
up with a Greek word
ATOMOS
___________________________, which means
indivisible or uncuttable. He theorized that
everything is composed of indivisible particles that
are always in motion and between these particles lie
an empty space
ERNEST RUTHERFORD discovered the
__________________________
central structure of the atom, which he called
NUCLEUS
___________________________ through the
GOLD FOIL experiment. He
___________________________
observed some of the alpha rays deflect or bounce
back when it hits the gold foil. He called his model
the ___________________________ of an atom.
NUCLEAR MODEL
WERNER KARL stating
This theory was backed up by ___________________________,
that since electrons are very small particlesHEISENBERG
in an atom, its location
cannot be exactly known and how it is moving. This theory is known
as the
HEISENBERG UNCERTAINTY PRINCIPLE
______________________________________________________.
wherein the nucleus is surrounded by clouds of electron density or
ELECTRON CLOUD
___________________________. In these clouds, there are regions
called __________________________ ELECTRON ORBITAL
where electrons are likely to be
found. This model is also based on the __________________________,
thatWAVE -PARTICLE
just like DUALITY
light, electrons can behave as wave and particle at the
same time, which was proposed by __________________________.
LOUIE DE BROGLIE
In 1926, an Austrian physicist,
ERWIN SCHRODINGER
___________________________, came up
with his own model, which he called
QUANTUM MECHANICAL
___________________________. He
MODEL
proposed that, rather than the electrons
moving in fixed orbits or shells, these
electrons behave as waves.
JOSEPH JOHN THOMSON discovered that
___________________________
atoms consist of negatively charged particles known
ELECTRONS through his
as ___________________________
CATHODE RAY
___________________________ TUBE He
experiment.
called his model the ___________________________.
PLUM PUDDING MODEL
EUGEN GOLDSTEIN
___________________________
discovered the positively-charged particles
called ___________________________.
PROTONS
___________________________
NIELS BOHR proposed
that electrons travel in around the nucleus
in well-defined paths called
___________________________. He
called his model the
ORBITS
___________________________ because
PLANETARY
it resembles the our MODEL
very own solar
system.
PLUM PUDDING JOSEPH JOHN
MODEL THOMSON
PLANETARY Niels
MODEL bohr
Nuclear Ernest rutherford

model
Quantum mechanical Erwin Schrodinger

MODEL
Billiard ball or solid sphere John

MODEL dalton
protons
___________________ 1. These are subatomic particles
that are positively-charged.
nucleus
___________________ 2. The central part of an atom.
atoms
___________________ 3. These are the building blocks
of a chemical element.
electrons
that are negatively-charged.
Atomic number
___________________ 5. It represents the number of
protons in an atom.
MASS NUMBER 6.
___________________ It refers to the total number of
protons and neutrons in an
atom.
NEUTRAL ATOMS 8.
___________________ Atom with the same number of
protons and electrons
ATOMIC MASS 9.
___________________ The average mass of an atom,
with all its naturally occurring
isotopes.
ATOMIC NUMBER 10.
___________________ It represents the number of
protons in an atom of an
element
ISOTOPES
___________________ 11. Forms of an element having
the same number of protons
but different number of
neutrons
neutrons
that has no charge or are
uncharged.
Neutral atoms
___________________ 8. Atom with the same number
of protons and electrons
Atomic mass
___________________ 9. The average mass of an atom,
with all its naturally occurring
isotopes.
ISOTOPES
___________________ 11. Forms of an element having
the same number of protons
but different number of
neutrons
Protons and neutrons 12.
___________________ These are found in the nucleus
of an atom.
nucleons
.___________________ 13. A collective term for protons and
neutrons.
Equation used to get the number of neutrons in an atom:
Neutrons = Mass number – protons
14. _____________________________________________
Equation used to get the mass number of an atom:
Mass number = protons + neutrons
15. _____________________________________________
electrons
neutrons
protons
nucleus
NAME OF ATOM: CARBON

1. A physicist is examining two atoms. One atom has a nucleus
of eight protons and eight neutrons while the other has a
nucleus with eight protons and nine neutrons surrounded by
eight electrons. What could be the conclusion of the physicist?
a. These atoms cannot form compounds.
b. The two atoms have different charges.
c. The two atoms are of the same element.
d. The two atoms have different atomic number.

Number of Number of Number of
electrons neutrons protons
Atom 1 8 8 8
Atom 2 8 10 8
Atom 3 10 8 7
Atom 4 10 9 8
2. The table below describes four different atoms.
Which of the following statements is TRUE?
a. Each atom is a different element.
b. Only Atoms 3 and 4 are the same element.
c. Atom 3 is a different element from all the
others.
d. Atoms 4 is a different element from all the
others.
3. Emmanuelle drew two atoms as shown in the
following illustration. Which of the following
statements best describes his drawing of the two
atoms?
a. They are atoms of two different elements.
b. They are both atoms of the same element.
c. Atom 1 has positive charge, while Atom 2 has
negative charge.
d. Atom 1 has negative charge, while Atom 2 has
positive charge.
4. Atoms are made up of smaller particles which are called
subatomic particles. Which subatomic particle has no
charge?
a. Electrons c. Nucleons
b. Neutrons d. Protons
5. Which subatomic particle is responsible for the
charge of an atom?
c. Electrons c. Nucleons
d. Neutrons d. Protons

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JAMES CHADWICK

Nuclear Ernest rutherford

Quantum mechanical Erwin Schrodinger

Billiard ball or solid sphere John

NAME OF ATOM: CARBON

a. These atoms cannot form compounds.

b. The two atoms have different charges.

c. The two atoms are of the same element.

d. The two atoms have different atomic number.

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