Question 3 :
Atomic number _______ by one unit on moving from right to left.
Question 6 :
According to Mendeleev's periodic law, the properties of elements are a periodic function of:<br/>
Question 7 :
The zigzag line in the periodic table separates ....... from .............
Question 9 :
The element with atomic number $14$ is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
Question 12 :
The number of metalloids in the modern periodic tables are :
Question 14 :
Most metallic element has the following electron arrangement in its atom is :<br/>
Question 16 :
Which one of the following does not increase while moving downthe group of the periodic table?<br>
Question 17 :
An element which is a soft and reactive metal is :<br/>
Question 18 :
The family of elements having seven electrons in the valence shell is :
Question 22 :
Assertion: The Newland's law of octaves fail.
Reason: The properties of elements beyond atomic weight 40 cannot be explained.
Question 23 :
The name given by Newlands to the arrangement created by him was :
Question 24 :
Which scientist came up with the concept of a periodic table that included all of the known elements?<br>
Question 25 :
The element placed with cerium, in the table formed by Newlands' was :
Question 26 :
The long form of the periodic table consists of ___ horizontal rows and ___vertical columns.
Question 28 :
The distance between the centre of nucleus and the outermost shell of an isolated atom is known as :
Question 29 :
How did Mendeleev predict the existence of some yet to be discovered elements in his periodic table?<br/>
Question 31 :
The element present in the III A group and 3rd period in the periodic table is :<br/>
Question 34 :
Metals can produce sound when struck, this property of metals is known as sonority.
Question 35 :
Which of the following element belongs to the group 1 ?
Question 36 :
In Newlands' table, which of the following elements was not placed in the same group in which cobalt and nickel were present?
Question 37 :
Which among the following is not an anomalous pair in Mendeleev's periodic table?
Question 39 :
The lanthanide series starts from and ends in which atomic number?
Question 40 :
The smallest period in the modern periodic table contains ............ elements.
Question 41 :
Whose name is not associated with the development of periodic Table
Question 42 :
Compare the radii of two species X and Y.<br/>(a) X has 12 protons and 12 electrons.<br/>(b) Y has 12 protons and 10 electrons.<br/>
Question 44 :
Out of the elements with atomic numbers givenbelow which one would be a halogen?<br>
Question 46 :
With increasing atomic number, the metallic nature in a period from left to right :<br/>
Question 48 :
The number of electrons in the valence shell is equal to :
Question 49 :
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. Such an arrangement of elements called as :<br/>
Question 51 :
By considering their position in the periodic table, which one of the following elements would you expect to have maximum metallic characteristic?: Ga, Ge, As, Se and Br
Question 52 :
Name three elements that have a single electron in their outermost shells.
Question 53 :
Name two elements that have two electrons in their outermost shells.
Question 54 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'Si'.
Question 55 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'C'.
Question 56 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'K'.
Question 57 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'Al'.
Question 59 :
Use Mendeleev's periodic table to predict the formulae for the oxides of the elements 'Ba'.
Question 60 :
What were the criteria used by Mendeleev in creating his periodic table?
