교과서 질문
Write the symbol for each element and classify it as a metal, nonmetal, or metalloid. a. bromine b. potassium c. lead d. silicon e. silver
2. Atoms & Elements
Periodic Table: Classifications
Multiple Choice
How many elements occur naturally on the periodic table?
A
118
B
92
C
86
D
104
검증된 단계별 안내1
Understand that the periodic table consists of elements that are either naturally occurring or synthetic.
Recognize that naturally occurring elements are those that can be found in nature without human intervention.
Recall that the periodic table is organized by atomic number, which is the number of protons in an element's nucleus.
Identify that elements with atomic numbers 1 (Hydrogen) through 92 (Uranium) are considered naturally occurring.
Note that elements with atomic numbers greater than 92 are typically synthetic and not found naturally on Earth.
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