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Question
Identify the symbol for the missing element in each group.
He
Ne
Kr
Xe
Identify the symbol for the missing element in each group.
He | Ne | Kr | Xe |
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Solution
The atomic number of helium (He) is 10.
Electrons per shell are 2.
According to the periodic table,
Helium is a noble gas.
It belongs to group 18.
So, the remaining elements also belong to group 18.
The elements of group 18 are helium, neon, argon, krypton, xenon, and radon.
Hence, the missing element is Argon.
The atomic number of helium (He) is 10.
Electrons per shell are 2.
According to the periodic table,
Helium is a noble gas.
It belongs to group 18.
So, the remaining elements also belong to group 18.
The elements of group 18 are helium, neon, argon, krypton, xenon, and radon.
Hence, the missing element is Argon.
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