2.1-2.2 Quiz Chem

Periods

Rows on the periodic table

Groups / Families

Columns on the periodic table

Group 1 (Alkali Metals) & Group 7 (Halogens)

The most reactive groups on the periodic table

Group 8 (Noble Gases)

Unreactive or inert elements that do not react

Atom

The simplest unit of an element that still retains the element's properties

Subatomic Particles

Protons, electrons, and neutrons

Nucleus

The center of an atom that contains protons and neutrons

Energy Levels

Area surrounding the nucleus containing electrons

Atomic Number

The number of protons in the nucleus (determines the element type)

Proton Charge

Positive charge

Neutron Charge

Neutral charge (no charge)

Electron Charge

Negative charge

Mass Number Formula

Protons + Neutrons

Neutron Formula

Mass Number - Protons

Neutral Atom Rule

In a neutral atom, electrons equal protons

Most reactive nonmetal in Period 4

Bromine (Br)

Isotopes

versions of the same chemical element that have the same number of protons but a different number of neutrons

Atomic Mass

The average mass of all isotopes of a given element

Mass number (Meaning)

is total protons + neutrons;

Atomic number (Meaning)

total protons in the nucleus