객관식
How many periods (horizontal rows) are on the modern periodic table?
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4. Atoms and Elements
Periodic Table: Classifications
Multiple Choice
How is the periodic table primarily organized?
A
By increasing atomic number (number of protons) from left to right across each period
B
By increasing atomic mass from left to right across each period
C
By grouping elements randomly based on their most common oxidation state
D
By arranging elements alphabetically by their chemical symbol
검증된 단계별 안내1
Understand that the periodic table is a systematic arrangement of elements based on their atomic structure and properties.
Recall that each element has an atomic number, which is the number of protons in its nucleus, and this number uniquely identifies the element.
Recognize that the periodic table is arranged in rows called periods and columns called groups or families.
Know that the primary organization principle is that elements are placed in order of increasing atomic number from left to right across each period.
This arrangement reflects periodic trends in chemical properties, as elements with similar properties appear in the same group (column).
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