The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
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Answer:
2 and 10 they are Noble gases (helium and neon
6 and 10(carbon and neon
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Inert Gases are Stable
Explanation:
(i) X and Z.
X has Atomic number = 2 that resembles Helium which is Stable inert gas hence its valency is Zero.
Similarly, Z has Atomic Number 8 that resembles Neon which is stable inert gas its valency is Zero.
(ii) Y and Z.
Elements Y and Z belong to the same period i.e. The Second period as they have two shells filled.
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