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Which period of the periodic table contains the element helium?
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2. Atoms & Elements
Periodic Table: Group Names
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Which group on the periodic table contains only elements that typically form cations in ionic compounds?
A
Group 16 (chalcogens)
B
Group 1 (alkali metals)
C
Group 17 (halogens)
D
Group 18 (noble gases)
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Understand that cations are positively charged ions formed when an atom loses one or more electrons.
Recall that elements in Group 1 (alkali metals) have a single electron in their outermost shell, which they tend to lose easily to form +1 cations.
Recognize that Group 16 (chalcogens) and Group 17 (halogens) typically gain electrons to form anions (negatively charged ions), not cations.
Note that Group 18 (noble gases) are generally inert and do not usually form ions because they have a full valence shell.
Conclude that the group containing only elements that typically form cations in ionic compounds is Group 1 (alkali metals).
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