Classification of Matter and Atomic Structure Quiz

Which of the following is a characteristic of a homogeneous mixture?

• Visibly different components

• Uniform throughout the mixture

• Cannot be physically separated

• Formed by two or more elements chemically joined together

What is the main difference between a compound and an element?

• Both are pure substances

• Compounds can be physically separated

• Elements are formed by two or more elements chemically joined together

• Compounds cannot be divided into simpler substances

Which of the following is an example of a heterogeneous mixture?

• Salt water

• Mouthwash

• Vegetable soup

• Smooth peanut butter

Where are electrons located in an atom?

• In the central nucleus

• In the electron clouds surrounding the nucleus

• Within the neutron

• In the outermost energy level

What is the atomic number of an element?

• The number of protons in an element

• The number of protons and neutrons in an element

• The number of total electrons in a neutral atom

• The identity of an element

What does it mean for an atom to be electronically neutral?

• It has an equal number of protons and electrons

• It has an equal number of protons and neutrons

• It has an equal number of electrons and neutrons

• It has a total charge of zero

Which of the following is a characteristic of metals?

• Shiny and good conductors of heat and electricity

• Dull in appearance and poor conductors of heat and electricity

• Semi-conductive and have varying physical properties

• Cannot be shaped easily

Elements in the same group of the periodic table have similar properties because they have the same number of:

• Protons

• Neutrons

• Electrons

• Valence electrons

Where are metalloids located on the periodic table?

• On the left side

• On the right side

• In between metals and nonmetals

• In the central nucleus

What is the most reactive electron in an atom?

• The one in the central nucleus

• The one in the electron clouds

• The one within the neutron

• The one in the outermost energy level