Multiple Choice
Which of the following elements is classified as a halogen?
2. Atoms & Elements
Periodic Table: Group Names
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Which of the following groups of elements tend to form cations?
A
Chalcogens (Group 16)
B
Halogens (Group 17)
C
Alkali metals (Group 1)
D
Noble gases (Group 18)
Verified step by step guidance1
Understand what a cation is: a cation is a positively charged ion formed when an atom loses one or more electrons.
Recall the general tendency of elements in different groups to lose or gain electrons based on their position in the periodic table.
Alkali metals (Group 1) have a single electron in their outermost shell, which they tend to lose easily to achieve a stable noble gas electron configuration, thus forming cations with a +1 charge.
Chalcogens (Group 16) and Halogens (Group 17) typically gain electrons to form anions (negatively charged ions) rather than losing electrons to form cations.
Noble gases (Group 18) are generally inert and do not tend to form ions because they already have a full valence shell.
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