periodic classification of elements class 10 mcq

Group of Li, Na, K are called 1. Metals 2. Alkaline earth metals 3. Inactive metals 4. Triad

Which of the following group of elements are triad 1. Na, Ne, k 2. Cl, Br, I 3. Li, Fe, Ni 4. C, N, O

Dobereiner arranged elements as 1. groups 2. periods 3. triads 4. All the above

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periodic classification of elements class 10 mcq

Which of the following is not a triad 1. S, Se, Te 2. Fe, Co, Ni 3. Li, Na, k 4. Na, Mg, Al

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Group of Li, Na, K are called 1. Metals 2. Alkaline earth metals 3. Inactive metals 4. Triad

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Which of the following group of elements are triad 1. Na, Ne, k 2. Cl, Br, I 3. Li, Fe, Ni 4. C, N, O

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Dobereiner arranged elements as 1. groups 2. periods 3. triads 4. All the above

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