a) Why do elements in a group have similar chemical properties?
b) Define Electron affinity. How it varies in a group and period?
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Elements in the group have similar chemical properties. This is because their atoms have the same number of electron in the highest occupied energy level.
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a) Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell (most chemical properties are dominated by the orbital location of the outermost electron).
b)when an electron is acepted by an atom energy is released and more the energy more is the electron affinity. it is dependent on the effective nuclear charge of an atom. so it decreases down the group and increases along a period from left to right.
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