Unit 2 Atomic Structure Test Review

Democritus called the building blocks of nature "atoms."

The word atom means...

• many

• unable to cut

• billiard ball

• really small

Based on the Rutherford Gold Foil Experiment, Rutherford determined that the atom is mostly

• protons

• electrons

• empty space

• neutrons

Based on the Cathode Ray Tube experiment, JJ Thomson determine that the atom contains negatively charged particles called

• photons

• protons

• neutrons

• electrons

Based on the Gold Foil Experiment, Rutherford determined that the atom must have a small, dense center of positive charge called the

• neutron

• nucleus

• electron orbital

Tags

NGSS.HS-PS1-8

One DIFFERENCE between the "Plum Pudding" model and the "Nuclear" Model is that the nuclear model has

• both positive and negative charges in the atom

• electrons scattered throughout the atom

• Positive change everywhere in the atom

• positive protons in the center called a nucleus

The atomic number of an atom is equal to the

• number of protons

• number of neutrons

• number of protons + neutrons

• mass number

The mass number of an atomic isotope is equal to the number of

• protons

• neutrons

• protons + neutrons

• electrons

Tags

NGSS.HS-PS1-8

Difference atoms of the same element can have different mass numbers.

• True

• False

Tags

NGSS.HS-PS1-8

In a neutral atom, the number of protons is equal to the number of electrons.

• True

• False

Different atoms of the same element can have different atomic numbers.

• True

• False