SECTION 4A AND 4B

Which of the following scientists demonstrated that fire could not be an element?

• Antoine Lavoisier

• Jacob Berzelius

• Johann Döbereiner

• Robert Boyle

How did the idea of triads influence the development of the periodic table, even

though more than three elements share similar properties?

• It established element families.

• It established element groups numbered 1–18.

• It gave rise to the idea of the law of octaves.

• It gave rise to the idea of periodicity.

The unique feature of Mendeleev’s classification method was that he

• arranged elements by atomic mass.

• arranged elements by atomic number.

• used superscripts to represent how many atoms were in each element.

• left blank spaces for predicted but undiscovered elements.

Which of the following scientists’ discoveries led to organizing the periodic table

using atomic number rather than atomic mass?

• Dmitri Mendeleev

• Henry Moseley

• Johann Döbereiner

• John Newlands

The modern periodic table has __________ periods and __________ groups.

• three; eight

• eight; three

• seven; eighteen

• eighteen; seven

___________ are represented by the columns of the periodic table.

• Elements
• Groups
• Periods
• Rows

Elements in the same group have the same

number of _______ and have similar physical and chemical properties.

• valence electrons

• mass

• periods

• atoms

________ are represented by

the rows of the periodic table.

• Groups
• Elements
• Compounds
• Periods

They designate the energy level of valence electrons:

• periods

• atoms

• elements

• nucleus

How would a highly conductive, malleable, and lustrous solid most likely be

classified?

• Metal
• Semiconductor
• Insulator
• Non-metal