Question

Which is the correct order of events (from earliest to most recent)?

A.
Mendeleev makes his periodic table.
Mendeleev predicts that there are elements not in his table.
Moseley arranges the periodic table in order of atomic number.
B.
Mendeleev makes his periodic table.
Moseley arranges the periodic table in order of atomic number.
Mendeleev predicts that there are elements not in his table.
C.
Mendeleev predicts that there are elements not in his table.
Mendeleev makes his periodic table.
Moseley arranges the periodic table in order of atomic number.

Answer 1

I need help

Answer 2

Which statement is correct?

A. Metallic elements tend to conduct electricity.
B. A row of the periodic table is called a group.
C. Nonmetals are all gases.
D. Metalloids have nothing in common with metals or nonmetals.

Answer 3

I am pretty sure A