The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
NCERT Class X
Science - Exemplar Problems
Chapter_Periodic Classification of Elements
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A,B and C form a triad as it follows Dobereneir triad law.
Li , Na and K is a example of it
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