Unit 1 Test 1 Review

Iron is a compound with the formula Fe2O3. Which elements combine to form rust?

• iron and acid

• iron and water

• iron and oxygen

• iron and air

The number of neutrons in an atom is found by subtracting:

• mass number from atomic number

• atomic number from electron number

• atomic number from mass number

• mass number from isotope number

What is the mass number of an atom with 17 protons, 17 electrons, and 18 neutrons?

• 17

• 34

• 52

• 35

Copper, silver, and nickel are all classified as:

• halogens

• nonmetals

• transition metals

• noble gases

Which part of an atom has the LEAST mass?

• proton

• electron

• nucleus

• neutron

Which statement BEST describes the organization of the Periodic Table of the Elements?

• Elements within a period have the same number of electrons.

• Gases easily form compounds with other elements.

• All gases are grouped together

• Elements within a group have similar properties.

Which substance is composed of only one type of atom?

• gold

• salt

• water

• sugar

Which describes a property of all elements?

• All elements are metals

• All elements exist in a solid phase.

• All elements are pure substances.

• All elements have six electrons.

Which of these is a homogeneous mixture?

• Italian Dressing

• Beach Sand

• Mixed Salad

• Chocolate Milk

Neon (Ne), Argon (Ar), and Krypton (Kr) are in the same column on the Periodic Table of the Elements. What characteristics do these elements have in common?

• full valence electron shells

• number of neutrons

• negative electrical charge

• atomic mass