Question

question 8
based on the article, which of these is true?
a. highly reactive metals are on the right side of the periodic table.
b. mendeleev helped john newlands with his experiments.
c. mendeleev arranged the elements by atomic number.
d. highly reactive metals are on the left side of the periodic table.

Explanation:

• Option A is false: Highly reactive metals are not on the right side; the right side has nonmetals and less reactive metals.
• Option B is false: Mendeleev and Newlands worked independently on periodic table organization with no record of Mendeleev assisting Newlands' experiments.
• Option C is false: Mendeleev arranged elements by atomic mass, while Moseley later reorganized them by atomic number.
• Option D is true: Group 1 (alkali metals) and Group 2 (alkaline earth metals), the most reactive metals, are located on the left side of the periodic table.

Answer:

D. Highly reactive metals are on the left side of the periodic table.