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Lesson one attempts of elements classification

The number of elements in Mendeleev’s periodic table is …….. elements
67
92
118
29
76
The scientist who left spaces in his table to be filledwith suitable discovered elements in future is ……
Moseley
Mendeleev
Bohr
Rutherford
Mendeleev classified the elements of each group into ….. subgroups
5
4
2
4
The nucleus of the atom contains………..
Negative protons
Negative electrons
Positive electrons
Positive protons
The scientist who discovered that the nucleus of atom contains positivity charged protons is …..
Bohr
Moseley
Mendeleev
Rutherford
The scientist ……..had discovered the main energy levels
Rutherford
Mendeleev
Bohr
Moseley
The number of energy levels in the heaviest known atom is …… levels
10
7
5
8
The modern periodic table consists of…..horizontal periods
18
10
14
7
The number of elements which exist in nature is….
118
67
29
92
The transitional elements start to appear from the beginning of the….period
Second
Third
Fourth
No correct answer
If the atomic number of an element is 15 so its group is located in ….. block
D
P
S
F
Elements of d block are arranged in ….. groups
6
10
2
5
Nobel gases are located in group …..
4A
6A
2A
18
In the periodic table the elements which are identical in properties lie in the same …..
The energy level
Period
Nucleus
Group
The atomic number of an element that exists in group 7A and period 2 is ….
7
9
12
17
The element whose atomic number 18 is …..
Metallic element
Inert gas
Halogen element
Transition element
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