how did mendeleev arrange the elements in his original periodic table? a. by atomic number b. by atomic…

how did mendeleev arrange the elements in his original periodic table? a. by atomic number b. by atomic weight c. by state of matter d. by chemical reactivity what is a key characteristic of elements in group 18 of the periodic table? a. high atomic mass b. full outer electron shell c. metallic properties d. high reactivity

how did mendeleev arrange the elements in his original periodic table? a. by atomic number b. by atomic weight c. by state of matter d. by chemical reactivity what is a key characteristic of elements in group 18 of the periodic table? a. high atomic mass b. full outer electron shell c. metallic properties d. high reactivity

Answer

Brief Explanations:

Mendeleev arranged elements by atomic weight in his original periodic - table. Elements in Group 18 have a full outer electron shell, making them stable and unreactive.

Answer:

  1. b. By atomic weight
  2. b. Full outer electron shell