The Modern Atomic Theory Answers

Which of the following did Antoine Lavoisier correctly characterize as an element?

Arranged elements by atomic number:

: As

: K

tin:

yttrium:

Which of the following did Antoine Lavoisier incorrectly characterize as matter?

Why did Mendeleev leave blank spaces in his version of the periodic table?

Organized elements into four groups based on properties:

Developed the law of octaves:

Identified triads of elements with similar properties:

From the list below, choose which groups are part of the periodic table.

Use the periodic table to identify the chemical symbol or name for each element below.zirconium:

: Yb

Use the periodic table to identify the name or atomic number for each element below. (Give the name, not the chemical symbol, for each element.)hafnium: atomic number

Which of these elements are you least likely to find in nature as a pure element (that is, not combined with any other elements in a compound)? Use the periodic table to answer the question.

Rb:

Ca:

Mg:

Cs: