Chapter 17: Properties of Atoms and the Periodic Table

Nonmetals

________ are located to the right of the metalloids.

Metals

________ are located to the left of the metalloids.

Metalloids

________ are located along the green stair- step line.

Quarks

________: Smaller particles that make up Protons and neutrons.

Neutrons

________: neutral particles that do not have an electrical charge.

Energy levels

________ are named using numbers one to seven.

Bubble chambers

________ can be used by scientists to study the tracks left by subatomic particles.

neutral atom

In a(n) ________, the number of electrons is equal to the number of protons.

models

Scaled- up ________ are often used to visualize things that are too small to see.

Isotopes

________: Atoms of the same element that have different numbers of neutrons.

Periodic Table

________: the elements are arranged by increasing atomic number and by changes in physical and chemical properties.

Atomic Mass

Average ________: the weighted- average mass of the mixture of its isotopes.

electrons mass

Because a(n) ________ is small and the electron is moving so quickly around the nucleus, it is impossible to describe its exact location in an atom.

Atom

the smallest piece of matter that still retains the property of the element

Protons

particles with an electrical charge of 1+

Neutrons

neutral particles that do not have an electrical charge

Quarks

Smaller particles that make up Protons and neutrons

Electron Cloud

the area around the nucleus of an atom where its electrons are most likely found

Atomic Number

The number of protons in an atom is equal to a number

Mass Number

The sum of the number of protons and the number of neutrons in the nucleus of an atom

Isotopes

Atoms of the same element that have different numbers of neutrons

Average Atomic Mass

the weighted-average mass of the mixture of its isotopes

Periodic Table

the elements are arranged by increasing atomic number and by changes in physical and chemical properties

Groups

families

Electron Dot Diagram

uses the symbol of the element and dots to represent the electrons in the outer energy level

Periods

The horizontal rows of elements on the periodic table