Multiple Choice
How many naturally occurring elements are there on the periodic table?
2. Atoms & Elements
Periodic Table: Classifications
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What do the elements lithium (Li), sodium (Na), potassium (K), and rubidium (Rb) have in common?
A
They are all transition metals.
B
They are all halogens.
C
They are all noble gases.
D
They are all alkali metals.
Verified step by step guidance1
Identify the group in the periodic table where lithium (Li), sodium (Na), potassium (K), and rubidium (Rb) are located. These elements are found in Group 1.
Understand the characteristics of Group 1 elements. Group 1 elements are known as alkali metals.
Recognize the properties of alkali metals: they are highly reactive, especially with water, and have one electron in their outermost shell.
Compare the properties of alkali metals with those of transition metals, halogens, and noble gases to confirm the correct classification.
Conclude that lithium (Li), sodium (Na), potassium (K), and rubidium (Rb) are all alkali metals based on their group placement and shared properties.
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