According to Moseley, a straight-line graph is obtained on plotting:
1. | The frequencies of characteristic X-rays of elements against their atomic numbers.
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2. | The square of the frequencies of characteristic X-rays of elements against their atomic numbers.
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3. | The square root of the frequencies of characteristic X-rays of elements against their atomic numbers.
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4. | The reciprocal of the frequencies of characteristic X-rays of elements against their atomic numbers. |
Those in a group that falls under the law of triads include:
1. Cl, Br, I
2. C, N, O
3. Na, K, Rb
4. H, O, N
The telluric helix was given by:
1. Newland
2. Mendeleev
3. Lothar Meyer
4. De-chancourtois
What is the combining ratio of a number of elements in group l with elements in group 17th of the periodic table ?
1. 1 : 2
2. 1 : 3
3. 2 : 1
4. 1 : 1
An atom of the element A has 3 electrons in its outermost shell while another atom X has 6 electrons in its outermost shell. The formula of the compound between A and X could be.
1. A2X3
2. AX3
3. A3X2
4. A2X