Multiple Choice
What do the elements lithium (Li), sodium (Na), potassium (K), and rubidium (Rb) have in common?
2. Atoms & Elements
Periodic Table: Classifications
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many elements occur naturally on Earth?
A
86
B
92
C
118
D
104
Verified step by step guidance1
Understand that the question is asking for the number of naturally occurring elements on Earth.
Recall that elements are defined by the number of protons in their atomic nuclei, and naturally occurring elements are those that can be found in nature without artificial synthesis.
Consider the periodic table, which organizes all known elements, both natural and synthetic.
Identify that the naturally occurring elements range from Hydrogen (atomic number 1) to Uranium (atomic number 92).
Conclude that there are 92 naturally occurring elements on Earth, as elements with atomic numbers 1 through 92 are found in nature.
2:40mWatch next
Master Periodic Table Classifications with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Periodic Table: Classifications practice set
Problem sets built by lead tutorsExpert video explanations