Physical Science Unit 7

Positive spheres

Cathode ray tube experiment, chocolate chip cookie, discovered electron

Gold foil experiment, shot alpha particles, proved that atoms are mostly empty space with positive center

Bohr model

Positive particles

Positive charge, in nucleus

Light ray moved towards the positive proving elections because opposites attract

Neutral charge, in nucleus

Negative charge, outside nucleus

Atomic number

Mass number - atomic number

Atomic number, unless different charge

Change element

Change mass (isotope)

Change charge (ion)

An atom that has a charge with non-equal protons and electrons which changed the charge

A negative ion with gained electrons and more electrons than protons

A positive ion with lost electrons and more protons than electrons

Same element with a different number of neutrons which changes the mass

The average mass of all known isotopes of a given element

The mass of a specific isotope and atom

Protons + neutrons

Period of the element

Vertical

Horizontal

How often something occurs on Earth

(mass x % as decimal)

Amu

Number of electrons in the outermost shell of an element

Left of staircase

Right of staircase

On staircase

Same number of valence electrons

Same number of rings

Dalton, Thomson, Rutherford, and Bohr