The History and Arrangement of the Periodic Table Answers

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

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

Arranged elements by atomic number:

alkali metal:

potassium (K):

strontium (Sr):

: 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 ⇒ 72

osmium: atomic number ⇒ 76

magnesium: atomic number ⇒ 12

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

Developed the law of octaves: LavoisierDobereiner✔ NewlandsMendeleevMoseley

Identified triads of elements with similar properties: Lavoisier✔ DobereinerNewlandsMendeleevX Moseley

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

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:

Mg:

Use the periodic table to choose the element that matches each description.halogen: sodium✔ iodinebarium

Use the periodic table to classify each of the elements below.cadmium (Cd):

The nonmetals include which of the following groups? Use the periodic table to answer the question. Check all that apply.