교과서 질문
Identify each of the following elements as a metal, a nonmetal, or a metalloid:
a. located in Group 2A (2)
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4. Atoms and Elements
Periodic Table: Classifications
객관식
In the periodic table, the horizontal rows are called what?
A
Orbitals
B
Groups
C
Families
D
Periods
검증된 단계별 안내1
Understand that the periodic table is organized in two main directions: horizontal rows and vertical columns.
Recall that the vertical columns in the periodic table are called 'Groups' or 'Families', which group elements with similar chemical properties.
Recognize that the horizontal rows are called 'Periods', which represent elements with increasing atomic number from left to right.
Note that 'Orbitals' refer to regions around an atom's nucleus where electrons are likely to be found, not to rows or columns in the periodic table.
Therefore, the correct term for the horizontal rows in the periodic table is 'Periods'.
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