H Chem test 2

The 3 fundemental subatomic particles, Alpha, beta, gamma rays, Atomic structure, and distingushing between atoms

Who was the first to propose the idea of atoms

Democrutus

Who made the atomic theory

John Dalton

Who discovered the electron

J.J. Thomson, a physicist who conducted experiments with cathode rays and identified the electron as a subatomic particle.

Who made the plum pudding model

J.J. Thomson, who proposed that atoms are made up of a positively charged substance with negatively charged electrons embedded within it.

Who made the nuclear model

Ernest Rutherford, who conducted the gold foil experiment that led to the discovery of the atomic nucleus and proposed a model where electrons orbit a dense, positively charged nucleus.

Who figured out that the atom is mostly space and has a dense nucleus

Ernest Rutherford, who demonstrated through his gold foil experiment that most of an atom's volume is empty space surrounding a small, dense nucleus.

Who provided evidence of the proton

Goldstein discovered the proton using a cathode ray tube experiment, showing that atoms contained positively charged particles.

What year was the proton discovered

1886

Who provided evidence of the neutron

Chadwick

What year was the neutron discovered

1932

The symbol for gamma rays

The symbol for Beta particles

The symbol for Alpha particles

Hetrogenus

Not uniform throughout

Homogenus

Uniform composition, called a solution

How do compounds turn back into their original elements

They chemically decompose

All the chemical change signs

Change in smell, Temp, Color, Gas, and forming of perciptate

Thing to remember about physical changes

If something new is created it is not a physical change

Gas

Has a indefinite shape and volume

Solids

Have a definite shape and volume

Liquids

Don’t have a definite shape but not a definite volume

Physical traits

Texture, color, Temp it melts at, and WEIGHT

What does AMU stand for

Atomic mass unit

Isotopes

Same protons, diff mass number and diff neutrons

Atomic number equals?

The amount of protons

What are radio isotopes

Unstable Isotopes that cause radiation

All isotopes with an atomic number greater than 83 are…

all isotopes with atomic number greater than 83 are radioactive

What particle occurs in heavier atoms

Alpha particles (Heavy answer)

Positron

the same as an electron

Fission

Bombarding of neutrons to split the nucleus

Fusion

Two light atomic nuclei combining

Mass of a alpha particle

4

Mass of Beta particle

1/1837

Mass of a Gamma ray

0

Charge of a alpha particale

+2

Charge of a Beta particle

-1

Charge of a gamma ray

0

Proton symbol

Electron symbol

Neutron symbol

Proton charge

1+

Neutron charge

0

Electron charge

-1

Mass of a proton

1.007

Mass of neutron

1.009

Mass of electron

5.486×10

What can stop alpha particles

paper

What can block beta particles

Metal foil

What can stop Gamma rays

Nothing, but thick lead or concrete can slow them down and contain them a bit.

What is a half life

The time required for ½ of nuclei of radistopes to decay

Does fusion or fission make energy

Both do