8.5 B CFA

Which statement BEST describes the organization of the periodic table of the elements?

• All gases are grouped together.

• Gases easily form compounds with other elements.

• Elements within a group have similar properties.

• Elements within a period have the same number of electrons

On the periodic table, why are all noble gases placed in column 18 (8A)?

• Noble gas elements have identical molar masses

• Noble gases are all rarer than elements in other columns

• The noble gases only chemically react with other noble gases.

• The valence electron configuration is similar in all noble gas elements

Based on the periodic table, how many protons are found in an atom of iron (Fe)?

• 8

• 26

• 30

• 56

What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?

• very high melting point

• gas state at room temperature

• good conductor of electric current

• extremely brittle solid at room temperature

Which is a common property of the two atoms shown?

• The electron structure supports inactivity

• The electrons in both are available to bond

• The number of protons is the same in both atoms

• The valence electrons in both atoms bond with metals only

Tags

NGSS.MS-PS1-1

Elements are identified by their atomic number because

• the mass of an element changes over time.

• the number of protons remains constant.

• atoms of the same element have different numbers of neutrons

• elements in a group react in a similar way

What is the mass of the atom?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

A student observes a substance that is highly reflective and able to conduct electricity. The substance also has a high melting point. Which is the MOST likely classification for this substance?

• salt

• glass

• metal

• plastic

Tags

NGSS.MS-PS4-2