Chapter 17

A chemical symbol represents the ______ of an element.

A.Name

The _________ is used to accelerate protons in the study of subatomic particles.

A.Tevatron

Elements in groups 3 through 12 are called _________.

B.Transition Elements

A certain atom has 26 protons,26 protons, and 30 neutrons. Is mass number is _______.

D.56

A particle that moves around the nucleus is a(n) ___________.

D.Electron

Each energy level of an atom has a maximum number of ________ it can hold.

D.Electrons

Atoms of the same element with different numbers of neutrons are called _______.

D.Isotopes

Dot diagrams are used to represent _____.

D.Outer Electrons

Horizontal rows of the periodic table are called _______.

D.Periods

Particles of matter that make up protons and neutrons are ________.

D.Quarks

The central core of an atom is called the hub

False nucleus

The maximum number of electrons in the second energy level of an atom is 4.

False,8

The weighted average of the mass number of all the isotopes that occur in the nature for a particular element is the average atomic number.

False,Atomic Mass

The number of protons in an atom is called the atomic mass.

False,Atomic Number

The symbol for chlorine is C.

False,Cl

As you move from left to right in a row of the periodic table,metallic properties increase.

False,Decrease

A diagram showing only outer energy level electrons is called a(n) periodic table.

False,Electrons Dot Diagram

The atomic masses of the elements are not whole value numbers because of the existence of quarks.

False,Istopes

Elements having three or fewer electrons in the outer energy level are classified as nonmetals.

False,Metals

The mass of an electron is about equal to the mass of a proton.

False,Neutron

Seven electrons in the outermost energy level is characteristic of a metal.

False,Nonmetals

The region around the nucleus occupied by the electrons is called the negative zone

False,electron cloud

Elements arranged in vertical columns is the periodic table are called periods

False,groups

Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two electrons.

False,neutrons

According to present atomic theory,the location of an electron is an atom is best represented by a probability cloud.

True

Nonmetals are poor conductors of heat and electricity.

True

Quarks can be produced by bombarding protons with protons.

True

The chart showing the classifications of elements according to their properties and increasing atomic numbers is called the periodic table.

True

The identity of an element is determined by the number of protons.

True

The sum of the number of protons and the number of neutrons in an atom is the mass number.

True