| 31. | Who did the first classification of elements |
A. Lothar Mayer | |
B. Newlands | |
C. mendeleev | |
D. dobereiner |
| 32. | Who propounded the ‘law of three’ related to the classification of elements? |
A. Lothar Mayer | |
B. dobereiner | |
C. mendeleev | |
D. Newlands |
| 33. | Who propounded the ‘octet rule’ related to the classification of elements? |
A. Duma | |
B. dobereiner | |
C. Newlands | |
D. mendeleev |
| 34. | If the elements are written in the order of increasing atomic mass, then every eighth element will have the same properties as the element before it. |
A. mendeleev’s periodic law | |
B. Doebner’s Trigonometry | |
C. Duma’s effort | |
D. newlands rule of octets |
| 35. | The physical and chemical properties of elements are periodic functions of their atomic masses, given the law |
A. Mendeleev | |
B. Moseley has | |
C. Rutherford | |
D. Newlands has |
| 36. | According to Mendeleev, the properties of elements are periodic functions |
A. of atomic weight | |
B. of atomic volume | |
C. of atomic number | |
D. of atomic density |
| 37. | Which scientist first created the ‘Periodic Table’ |
A. mosley | |
B. mendeleev | |
C. Dalton | |
D. rutherford |
| 38. | who propounded the modern periodic law |
A. Newlands has | |
B. Dobereiner | |
C. Mendeleev | |
D. Moseley has |
| 39. | The basis of classification of elements in Mendeleev’s periodic table was |
A. atomic mass | |
B. atomic number | |
C. atomic volume | |
D. atomic density |
| 40. | The basis of classification of elements in the modern periodic table is |
A. atomic number | |
B. atomic mass | |
C. atomic volume | |
D. atomic density |