Periodic Table and Reactivity

An atom has 18 protons and 8 valance electrons. Which statement would best identify this

element?

• The element is highly reactive with eight electrons in its outer shell.

• The element has an atomic mass of 18.

• The element is “happy” or stable because it outer energy level is filled.

• The element is a metal.

Tags

NGSS.MS-PS1-1

Sodium (Na) is a highly reactive element. Which characteristic of sodium is responsible for

its reactivity?

• It has 11 protons.

• Its atomic mass is 22.990.

• It is a non metal.

• It has one valance electron.

Determine which atom is being described here: Shiny, has the properties of both metals

and nonmetals, and has three valance electrons.

• Boron (B)

• Germanium (Ge)

• Antimony (Sb)

• Tin (Sn)

Tags

NGSS.MS-PS1-1

Which two elements are in the same Period?

• Lithium and Magnesium

• Boron and Carbon

• Potassium and Sodium

• Zinc and Nitrogen

Of the four atoms above, which two would be in the same Group?

• 1 & 2

• 1 & 4

• 1 & 3

• 2 & 3

Tags

NGSS.MS-PS1-1

Which two elements would have the same number of energy levels (shells)?

• Copper and Zinc

• Nickel and Palladium

• Magnesium and Lithium

• None of these elements

Use letters A - H to answer the following.

Which 2 letters would have one valence electron?

• H & D

• A & E

• C & F

• B & C

Tags

NGSS.MS-PS1-1

Use letters A - H to answer the following.

Which letter would be the MOST reactive on this table?

• A

• D

• C

• E

Use letters A - H to answer the following.

Which letter would be chemically stable or Inert?

• D

• B

• A

• E

Use letters A - H to answer the following.

Which 2 letters would have the same number of energy shells?

• A & E

• G & C

• H & D

• E & F