Atomic Structure: Study Guide

Atom

• The basic unit of a chemical element

• The basic unit of a atom

• The smallest thing a atom can be broken down into

• An element

Why is an atom neutral?

• Equal number of neutrons and atomic number

• Equal number of protons and electrons

• Equal number of neutrons and protons

• Equal number of electrons and atomic mass

Electron Cloud

• All the weight of the atom

• Almost all of the volume of the atom

• Where the protons are found

• Where the electrons are found

Electrons

• Negative

• Positive

• Inside nucleus

• Outside nucleus

What determines which element an atom is?

• Number of protons

• Number of electrons

• Atomic Mass

• Number of neutrons

Neutrons

• Neutral

• 1 amu

• Inside nucleus

• Outside nucleus

• Negative

Atomic Number

• Number of protons

• Number of electrons

• Number of neutrons

• Atomic Mass

Mass Number

• Sum of protons and neutrons

• Sum of protons and electrons

• Atomic weight

• Isotope / Neutrons

1 amu is = to

• 1/12 the mass of carbon 12

• the mass of one atom of carbon-12

• 1/13 of carbon-13

• the mass of one atom of carbon-13

Hyphen Notation is

• The mass number is written with a hyphen after the element name.

• The atomic number is written with a hyphen after the element name.