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1
How many elements are present in the shortest period of the modern periodic table?
2
3
4
Across a period going from one element to the next in the modern periodic table, the atomic number increases by
Which of the following scientists discovered that the atomic number of an element is a more fundamental property of an element than its atomic mass?
Newlands
Mendeleev
Dobereiner
Henry moseley
The element which show multiple valencies are know as
Alkali metals
Transition metals
Alkaline earth metals
Non- metals
5
How many elements are present in the third period of the modern periodic Table?
8
18
32
6
Which of the following elements has a complete octet of electrons?
Fluorine
Oxygen
Krypton
Lithium
7
In the modern periodic Table there are _________ groups and________ periods.
18 , 7
7 , 18
8 , 17
17 , 8
Which of the following factors is responsible for the various chemical properties of elements?
Colour
Atomic radii
Electronic configuration
Density
9
Which of the following factors determines the group to which an element belongs?
Total number of electron shells
Number of valence electrons
Atomic size of the element
Melting point of the element
10
How many elements are present in the largest group of the modren periodic table?
11
Which of the following elements is a metalloid?
Carbon
Bismuth
Arsenic
Aluminium
12
The prediction of properties of an element can be made with more precision, if they are arranged on the basis of
Increasing atomic number
Decreasing atomic number
Increasing atomic mass
Decreasing atomic mass
13
Which of the following elements will be most non-metallic?
Chlorine
Bromine
Iodine
14
Which of the following elements present in group 15 has the smallest atomic radius?
Sb
P
As
Bi
15
Which of the following orders of elements is correct in terms of increasing metallic character?
Br<Cl<F
Sb<As<P
Sc<Ca<K
Rb<K<Na