Question

question 7 (1 point)
who arranged the elements according to atomic mass and used the arrangement to predict the properties of missing elements?
o a henry moseley
o b john dalton
o c dmitri mendeleev
o d antoine lavoisier

question 8 (1 point)
which of the following categories includes the majority of the elements?
o a metals
o b nonmetals
o c liquids
o d metalloids

question 9 (2 points)
of the elements pt, v, li, and kr, which is a nonmetal?
o a kr
o b v
o c li
o d pt

Explanation:

• Question 7: Dmitri Mendeleev arranged elements by atomic mass and predicted properties of missing elements. Henry Moseley used atomic number. John Dalton had atomic theory. Antoine Lavoisier was about combustion.
• Question 8: Metals are the majority of elements in the periodic table. Non - metals, liquids, and metalloids are fewer.
• Question 9: Kr (Krypton) is a noble gas (non - metal). V (Vanadium), Li (Lithium), and Pt (Platinum) are metals.

Answer:

• Question 7: C. Dmitri Mendeleev
• Question 8: A. metals
• Question 9: A. Kr