Chemistry - Atoms

What does number 1 represent?

What does number 1 represent?

Atomic Number

What does the letter “H” represent?

Chemical Symbol

What does “Hydrogen” represent?

Name

What does 1.008 represent?

Atomic Mass

Atomic Mass

The number of protons + the number of neutrons

Atomic Number

the number of protons OR the number of electrons in an neutral atom

Isotopes

atoms of the same element w/ different number of neutrons

What changes in isotopes

MASS and MASS ONLY

the “A”

Mass Number

the “Z”

Atomic Number

the “X”

Chemical Symbol

Average Atomic Mass

The average mass of all of the isotopes of an element

the “E”

Charge (electric charge)

You find the neutrons how?

Mass Number - Atomic Number

Element

substance made up of only one type of atom, each with the same number of protons.

Atom

The smallest part of a substance that cannot be broken down chemically

Isotope

An element where the atom have the same number of protons but w/ different number of nuetrons

Ion

is an atom or molecule that is charged due to a difference in number of electrons and protons.

Cation

Positive charged atom

Anion

Negative charged atom

Where is a proton located (inside or outside the nucleus)?

Inside

Where is a neutrons located (inside or outside the nucleus)?

Inside

Where is a electron located (inside or outside the nucleus)?

Outside

Protons charge

Positive

Neutrons charge

Neutral

Electrons Charge

Negative

Protons relative charge?

1

Neutrons relative charge?

1

Electrons relative charge?

Negligible

What’s the atomic number determined by?

Protons

What’s the mass number determined by?

Neutrons and Protons

What’s the charge determined by?

protons - electrons

What does the atomic number identify?

Element

What does the mass number identify?

The mass

What does the charge identify?

atom (charge = 0; p = e)

ion (charge doesn’t = 0; p doesn’t = e)

400bc

Democritus

Atomos

Shape = Behavior

200bc

Aristotle

4 Elements

1789

Lavosier

Law of Conservation of Mass

1803

John Dalton

Solid Sphere

Everything’s made of indestructive spheres

1897

JJ Thompson

Plum Pudding

Showed atoms have smaller parts

1911

Ernest Rutherford

Alpha Beta Gamma Rays

Gold-Foil Experiment

1912

Henry Mosely

Atomic Mass

1913

Neil Bohr

Planetary

Everythings a circle w/ a positive center

1926

Erwin Schrodinger

Cloud of Electrons