Unit 1 & Unit 2

Mass Number is equal to:

• Electrons and Neutrons

• Neutrons and Protons

• Neutrons

• Protons

The most reactive group is:

• Noble Gases

• Halogens

• Alkaline

• Alkali

The least reactive group is:

• 1a

• 2a

• 8a

• 7a

The atomic number is equal to:

• Protons and Valence Electrons

• Protons and Neutrons

• Protons and Electrons

• The Nucleus

Tarnishing is an example of:

• Chemical Change

• Physical Change

• State of Matter

• Reactions

Conductivity of heat and electricity is

• Chemical Property

• Physical Property

Water evaporating into steam is...

• A production of gas

• Chemical change

• Change of State

• A mixture

The mass of an electron is

• the atomic number

• the mass number

• 1 amu

• 1/2000 amu

The Law of Conservation of Mass states

• Atoms cannot be created

• Atoms cannot be destroyed

• Matter is made of atoms

• Elements are Pure

All mass is accounted for because the Universe is a(n)

• Open System

• Infinite space

• Idea

• Closed System