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Attempts of elements classification

Total questions: 54

Worksheet time: 32mins

Name
Class
Date
1.
Mendleev classified the elements of each group into ………sub-groups
a)
2
b)
3
c)
4
d)
5
2.
The scientist who left vacancies in his table to be filled with suitable discovered elements in future is …….
a)
Mosely
b)
Rutherford
c)
Bohr
d)
Mendleev
3.
The nucleus of the atom contains……..
a)
positive electrons
b)
negative electrons
c)
negative protons
d)
positive protons
4.
The scientist, who discovered that the nucleus of atom contains positively charged protons is………
a)
Bohr
b)
Mendeleev
c)
Rutherford
d)
Mosely
5.
The scientist ……….had discovered the main energy levels.
a)
Bohr
b)
Mendeleev
c)
Hofmann
d)
Mosely
6.
The number of energy levels in the heaviest known atom is……levels
a)
5
b)
7
c)
8
d)
10
7.
The number of known elements in the modern periodic table till now is……
a)
216
b)
118
c)
316
d)
16
8.
The number of elements which exists in nature is ………..
a)
29
b)
118
c)
92
d)
102
9.
The moden periodic table consists of ………horizintal periods
a)
7
b)
10
c)
14
d)
18
10.
The moden periodic table consists of ………vertical groups
a)
7
b)
10
c)
14
d)
18
11.
The transitional elements start to appear from the beginning of the …….period
a)
second
b)
third
c)
fourth
d)
fifth
12.
The elements,which occupy the middle block (d) in periodic table are called ……elements
a)
transition
b)
alkali
c)
alkaline earth
d)
nobel
13.
The block which contains the group (1A) and (2A) in the periodic table is ….block
a)
s
b)
p
c)
d
d)
f
14.
Elements of d-block are arranged in …..groups
a)
2
b)
5
c)
6
d)
10
15.
If the atomic number of an element is 15, so its group is located in….the block
a)
s
b)
p
c)
d
d)
f
16.
Lanthanides and actinides are located in the …..block
a)
s
b)
p
c)
d
d)
f
17.
Nobel gases are located in group ……….
a)
7A
b)
8
c)
17
d)
18
18.
The atomic number of elements equals……
a)
(a) the number of neutrons inside the nucleus
b)
(b) the number of electrons which rotate in the energy levels around its atom's nucleus
c)
( c) the number of protons inside the nucleus
d)
(d) [b] and [c] are correct
19.
Elements of the same period in the modern periodic table have the same …….
a)
number of protons
b)
number of energy levels
c)
number of neutrons
d)
number of electrons in the outer enrgy level
20.
Elements of group (6A) in the periodic table have the same………
a)
number of protons
b)
number of energy levels
c)
number of neutrons
d)
number of electrons in the outer energy level
21.
The chemical elements have been categorized in a table to ease its study
a)
Right
b)
Wrong
22.
The modern peridic table is the first real table for classifying elements
a)
Right
b)
Wrong
23.
The elements with the same physical physical and chemical properties have been put in horizintal periods
a)
Right
b)
Wrong
24.
The number of recorded elements in mendleev's periodic table about 103 elemnets
a)
Right
b)
Wrong
25.

Mendleev classified elements of each group into two subgroups

a)
Right
b)
Wrong
26.
Mendleev discovered the properties of elements were repeated periodically by the beginning of each new group
a)
Right
b)
Wrong
27.
Mendleev arranged the elements descendingly according to their atomic weights
a)
Right
b)
Wrong
28.
Mendleev put more than one element in the same place like nickle and cobalt
a)
Right
b)
Wrong
29.
Bohr had discovered the main energy levels
a)
Right
b)
Wrong
30.
The modern periodic table is classified into 5 blocks
a)
Right
b)
Wrong
31.
The number of known elements till now 92 elements
a)
Right
b)
Wrong
32.
Rutherford discovered that the nucleus contains positive charged protons
a)
Right
b)
Wrong
33.
Inert gases are located in group zero on the left side of the periodic table
a)
Right
b)
Wrong
34.
Elements of d-block are arranged in 10 vertical columns
a)
Right
b)
Wrong
35.
Elements of p-block are arranged in 5 groups
a)
Right
b)
Wrong
36.
The transitional elments groups are symbolized by (d)
a)
Right
b)
Wrong
37.
The number of energy levels occupied by electrons in the atom of the elements indicates its group number
a)
Right
b)
Wrong
38.
Elements of group (A) are located in the middle of modern periodic table
a)
Right
b)
Wrong
39.

Moseley put ......... and ....... series below the periodic table.

(a)  

40.

Noble gases are located in group________

a)

0

b)

8

c)

18

41.

The atomic number of elements equals________

a)

the number of electrons which rotate in the energy levels around its atom's nucleus,

b)

the number of protons inside the nucleus.

c)

the number of neutrons inside the nucleus.

42.

The element located in period (3) and group (3A) is____

a)

Na (11)

b)

Al (13)

c)

P (15)

43.

The element whose atomic number (18) is------------

a)

transition element.

b)

noble gas

c)

metallic element.

44.

Mendeleev discovered that the atomic weights of elements increase on moving from______ side of the table to the _____ side in horizontal rows .

a)

left - right

b)

right - left

c)

middle - left

45.

One advantage of Mendeleev's table is correcting the wrongly estimated ________ of some elements.

a)

atomic weight

b)

atomic number

c)

atomic radius

46.

Mendeleev arranged the elements ascendingly according to atomic weight while Moseley arranged them ascendingly according to ________

a)

atomic size

b)

atomic radius

c)

atomic number

47.
The scientist who left vacancies in his table to be filled with suitable discovered elements in future is …….
a)
Mosely
b)
Rutherford
c)
Bohr
d)
Mendleev
48.
The nucleus of the atom contains……..
a)
positive electrons
b)
negative electrons
c)
negative protons
d)
positive protons
49.
The scientist, who discovered that the nucleus of atom contains positively charged protons is………
a)
Bohr
b)
Mendeleev
c)
Rutherford
d)
Mosely
50.
The scientist ……….had discovered the main energy levels.
a)
Bohr
b)
Mendeleev
c)
Hofmann
d)
Mosely
51.
The number of elements which exists in nature is ………..
a)
29
b)
118
c)
92
d)
102
52.

In Mendeleev’s table,the properties of elements were repeated periodically by the beginning of each new (a)  

53.

Each main energy level contains A definite number of energy (a)  

54.

the modern periodic table is the first real table for classifying elements..........???

a)

true

b)

false

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