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What is the atomic number of barium?
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2. Atoms & Elements
Periodic Table: Element Symbols
Multiple Choice
Which of the following best describes helium (He) on the periodic table?
A
It is a noble gas element.
B
It is a halogen.
C
It is an alkali metal.
D
It is a transition metal.
검증된 단계별 안내1
Recall the classification of elements on the periodic table based on their group/family and properties.
Identify helium's position on the periodic table: it is located in Group 18, which is the last column on the right.
Understand that Group 18 elements are known as noble gases, characterized by their full valence electron shells and low reactivity.
Compare helium to other groups: halogens are in Group 17, alkali metals in Group 1, and transition metals are found in the d-block (Groups 3-12).
Conclude that helium is best described as a noble gas element because of its group placement and chemical properties.
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