Which statements accurately describe trends found in the periodic table? Check all that apply.Henry Moseley established a periodic table that arranges the elements by atomic number.The atomic mass decreases from left to right on the periodic table.The atomic number increases from left to right on the periodic table.Nonmetals create a “staircase” down the periodic table.Metalloids have the characteristics of both metals and nonmetals.
Answer
A
Henry Moseley established a periodic table that arranges the elements by atomic number.
B
The atomic mass decreases from left to right on the periodic table.
C
The atomic number increases from left to right on the periodic table.
D
Nonmetals create a “staircase” down the periodic table.
E
Metalloids have the characteristics of both metals and nonmetals.
Explanation
Henry Moseley arranged the periodic table by atomic number, which increases from left to right across each period. Atomic mass generally increases rather than decreases across a period, so that statement is false. The staircase marks the boundary between metals and nonmetals; metalloids lie along it and have properties of both.
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