NEW
Font size
Worksheetslesson 1 part1 g8
Total questions: 8
Worksheet time: 4mins
1-The number of elements in Mendeleev's periodic table is .............................
elements.
a. 92
b. 118
c. 76
d. 67
2. The scientist who left empty cells in his table to be filled with discovered elements in future is ...........................
a. Moseley.
b. Rutherford.
c. Bohr.
d. Mendeleev.
3. Mendeleev classified the elements of each main group into .......... subgroups.
a- 2
b- 3
c- 4
d. 5
4-The scientist who discovered that the nucleus of the atom contains positively charged protons is..........................
a. Bohr
b. Mendeleev.
c. Rutherford.
d. Moseley.
5-The nucleus of the atom contains ............................
a. positive electrons.
b- negative protons.
c- negative electrons.
d. positive protons.
6-The scientist ............................... discovered the main energy levels of the atom.
a. Moseley
b. Bohr
c. Hofmann
d. Mendeleev
7-The number of energy levels in the heaviest known atom reaches ......................evels till now.
a- 5
b- 7
c- 8
d- 10
8- The number of known elements in the modern periodic table till now is............................
a. 216
b. 118
c. 316
d -16
