Unit 3 Periodic Table

The Modern atomic theory says:

• a. The atom is an unchangeable, uniformly dense, solid sphere.
• b. The nucleus contains positive protons surrounded by negative electrons.
• c. The nucleus contains both positive protons and neutral neutrons and is surrounded by negatively charged electrons.
• d. The atom has positively charged protons scattered throughout different orbitals with negatively charged electrons occupying different levels.

Which statement is true about solid non-metals?

• a. They have a shiny and lustrous surface.
• b. They are non-conductive, brittle, and non-ductile.
• c. They conduct electricity and heat.
• d. They are malleable and ductile.

These elements are located to the left of the stair-step line on the periodic table.

• a. alloys
• b. nonmetals
• c. metals
• d. metalloids

Which describes an atom which loses electrons to form a positive ion?

• a. sulfate
• b. polyatomic ion
• c. cation
• d. anion

Malleability

• a. allows matter to be hammered into shapes without breaking
• b. is how well a material resists deformation and returns to formal size and shape
• c. is how durable a material is
• d. is matter's ability to return to its original position when dropped

Horizontal rows of the periodic table are called:

• a. families
• b. periods
• c. groups
• d. clusters

A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its atomic mass is:

• a. 26
• b. 52
• c. 56
• d. 30

A chemical symbol represents the _______ of an element.

• a. name
• b. reaction
• c. protons
• d. structure

Which of the following is classified as a chemical change?

• a. evaporation of water
• b. burning of gasoline
• c. shredding of paper
• d. crushing of solid coal

At room temperature, most metals are:

• a. solids
• b. radioactive
• c. liquids
• d. gases