Question

developing a periodic table
in 1869, a russian chemist and teacher named dmitri mendeleev (duh mee tree - men duh lay uf) was working on a way to classify elements. at that time,
more than 60 elements had been discovered. he studied the physical
properties such as density, color, melting point, and atomic mass of each
element. mendeleev also noted chemical properties such as how each
element reacted with other elements. mendeleev arranged the elements in a
list using their atomic masses. he noticed that the properties of the elements
seemed to repeat in a pattern.
when mendeleev placed his list of elements into a table, he arranged them in
rows of increasing atomic mass. elements with similar properties were
grouped in the same column. the columns in his table are like the piles of
sorted objects in your junk drawer. both contain groups of things with
similar properties.
identify recall the four properties of elements that mendeleev studied when
developing his periodic table.
1.
3.
2.
4.

Explanation:

The text clearly states that Mendeleev studied physical properties such as density, color, melting point, and atomic mass of each element.

Answer:

1. Density
2. Color
3. Melting point
4. Atomic mass