# The Modern Periodic Table – How Many Elements Are There

These multiple choice questions MCQ – How Many Elements Are There In The Modern Periodic Table, test your understanding of the Elements of Modern Periodic Table. The concepts being tested are about periodic table of elements, periodic properties, history of the development of periodic table, electronic configuration, valency, Electropositivity, etc.
01.

Name the following: Group of three elements which show similar properties

02.
Fill in the Blanks: Law of Octaves: When the elements are arranged in an increasing
order of their atomic masses, the properties of ______ element are similar to the
first.”

03.
Find the odd one out: Atomic Weight, Density, Melting Point, Cost

04.
True or False: Atomic Radius, when moved in a period (Left to Right) increases

05.
Fill in the Blanks: _______ was placed in Zero-Group of a modern periodic table.

06.
Name the following: In a triad, which property of the middle element is the mean
of that of other two.

07.
Find the odd one out: Chlorine, Bromine, Iodine, Calcium

08.
Fill in the Blanks: _______ are Horizontal Rows (Numbered 1 to 7) in a modern periodic
table

09.
Name the following: Newland arranged elements according which property of an element
in increasing order

10.
The properties which shows gradual variation in a group and in a period, and they
repeat themselves after certain interval of atomic numbers are called
(a) Periodic Properties
(b) Physical Properties
(c) Chemical Properties
(d) Nuclear Properties

11.
Fill in the Blanks: Groups are arranged in _________ (Numbered I to VIII). Groups
I to VII are further divided into (A) and (B) subgroups

12.
Name the following: The two series of inner transition elements

13.
Find the odd one out: Dobereiner, Newland, Mendeleev, Newton

14.
Fill in the Blanks: Newland could arrange elements only upto ___________ out the
total 56 elements known at that time

15.
Name the following: Vertical column of a modern Periodic Table

16.
Fill in the Blanks: __________ was first to successfully classify all known elements

17.
What increases from 1 to 4 (for 2nd and 3rd Period) and then decreases from 4 to
0 ( Left to Right)
(a) Atomic Mass
(b) Valency
(c) Atomic Weight
(d) Electropositivity

18.
Find the odd one out: Boron (B), Silicon (Si), Germanium (Ge), Aluminium (Al)

19.
Fill in the Blanks: Eka-silicon is now known as ________

20.
Name the following: Horizontal row of a modern Periodic Table

21.
True or False: Atomic Radius, when moved in a group (Top to Bottom) increases

22.
Find the odd one out: Aluminium, Sodium, Potassium, Carbon

23.
Name the following: Periods and Groups in modern Periodic Table

24.
Fill in the Blanks: Scandium was earlier known as _________

25.
Find the odd one out: Aluminium, Sodium, Potassium, Mercury

26.
Fill in the Blanks: __________ discovered that Atomic Number is the most fundamental
property for classification, and not Atomic Mass

27.
Name the following: The shortest period of a modern Periodic Table

28.
Tendency of an element to lose electrons is called
(a) Electronegativity
(b) Conductivity
(c) Resistivity
(d) Electropositivity

29.
Fill in the Blanks: Modern Periodic Law: The physical and chemical properties of
elements are a periodic function (they repeat after an interval) of their______________.

30.
Find the odd one out: Valency, Atomic Size, Electropositivity, Hardness

### Answers to How Many Elements Are There In The Modern Periodic Table

02. eighth
03. Cost {Rest all are physical properties of a element}
04. False { It decreases }
05. Noble gases
06. Atomic Mass
07. Calcium {Rest all are Halogens}
08. Periods
09. Atomic Mass
10. (a) Periodic Properties
11. Vertical Columns
12. Lanthanides & Actinides
13. Newton {Rest all are scientist connected with classification of elements }
14. Calcium
15. Group
16. Mendeleev
17. (b) Valency
18. Aluminium {Rest all are metalloids }
19. Germanium
20. Period
21. True { Because more shells are added }
22. Carbon {Rest all are metals }
23. 7 Periods and 18 Group
24. Eka-boron
25. Mercury {Rest all are solid metals }
26. Henry Moseley
27. First Period { has only two elements}
28. (d) Electropositivity
29. atomic numbers
30. Hardness {Rest all are periodic properties }