Question 1 :
Which of the following is the outermost shell for elements of period 2?
Question 2 :
Name the most electropositive element among the elements with atomic number 3 to 9, based on the following trends of the periodic table:
(a) Electropositive nature of the element(s) increases down the group and decreases across the period.
(b) Electronegativity of the element decreases down the group and increases across the period.
(c) Atomic size increases down the group and decreases across a period (left to right).
(d) Metallic character increases down the group and decreases across a period.
Question 3 :
An element B have 4 electrons in its outermost shell. Give the group number to which it belong in Modern Periodic Table.
Question 4 :
An atom with electronic configuration (2, 8, 7) will have similar chemical properties to which of the following elements?
Question 5 :
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide. What will be the nature of oxide of element Y?
Question 6 :
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al
Question 7 :
Identify the first metalloid in Modern Periodic Table whose fibres are used in making bullet-proof vests.
Question 8 :
An element B have 4 electrons in its outermost shell. Find its valency.
Question 9 :
Identify a radioactive element which is the last member of halogen family.
Question 10 :
An element is placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide. Write the balanced equation when it burns in the presence of air.
Question 11 :
Which of the following statements about the Modern Periodic Table is correct:
Question 12 :
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide. Identify nature of X.
Question 14 :
Which of the following set of elements is written in order of their increasing metallic character?
Question 15 :
Can the given groups of elements be classified as Dobereiner's triad ?
Be, Mg, Ca
Question 16 :
On moving from left to right in a period in the periodic table, the size of the atom.
Question 17 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d77273b230584979c0c.png' />
In the above table, the position of three elements A, B and C in the periodic table is shown, state whether A is a metal or non metal.
Question 19 :
Identify and name the element whose electronic configuration is 2, 8, 7
Question 20 :
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants. Identify the element X.
Question 21 :
Name two elements you would expect to show similar chemical reactions like magnesium.
Question 22 :
Identify the metal which exists in liquid state at room temperature.
Question 23 :
Mendeleev predicted the existence of certain elements not known at that time and named it as Eka-silicon. What is the period of this element in the modern periodic table?
Question 24 :
Determine the valency of the element whose atomic number is 7.
Question 25 :
What would be the electronic configuration of the element whose atomic number is 10.
Question 26 :
Where would you locate a soft metal stored under kerosene in the periodic table?
Question 27 :
What are the similarities in the atoms of helium and neon?
Question 28 :
Identify the period number of the element whose atomic number is 7.
Question 29 :
Where would you locate an element wose thin oxide layer is used to make other elements corrosion resistant by the process of 'anodising', in the periodic table?
Question 30 :
Identify an element used in making flourescent bulbs and is second member of group 18 in modern periodic table.
Question 31 :
Identify the group number of the element whose atomic number is 10.
Question 32 :
Which one of the following does not increase while moving down the group of the periodic table?
Question 33 :
Write the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17).
Question 35 :
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of Periodic Table?
Question 36 :
Can the given groups of elements be classified as Dobereiner's triad ?
Na, Si, Cl
Question 38 :
If an element X is placed in group 14, what will be the formula of its chloride.
Question 39 :
Nitrogen (atomic number 7) and phosphorous (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements.
Question 40 :
Where would you locate an element with variable (more than one) valency stored under water, in the periodic table?
Question 41 :
Name the element which is metalloid among the elements with atomic number 3 to 9, based on the following trends of the periodic table:
(a) Electropositive nature of the element(s) increases down the group and decreases across the period.
(b) Electronegativity of the element decreases down the group and increases across the period.
(c) Atomic size increases down the group and decreases across a period (left to right).
(d) Metallic character increases down the group and decreases across a period.
Question 42 :
Which of the following statement(s) about the Modern Periodic Table are incorrect
(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number
(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses
(iii) Isotopes are placed in adjoining group(s) in the Periodic Table
(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
Question 43 :
Which element has a total of three shells, with four electrons in its valence shell?
Question 44 :
Arrange the following metals in increasing order of their reactivity.
Na, K, Ca, Hg
Question 45 :
Identify and name the element whose electronic configuration is 2, 1
Question 46 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d79273b230584979c0e.png' />
In the above table, the position of three elements A, B and C in the periodic table is shown, will C be larger or smaller in size than B?
Question 47 :
Identify and name the element whose electronic configuration is 2, 8, 2
Question 49 :
What is the nature of the bond formed when the element A (atomic number 19) combines with the element B (atomic number 17).
Question 50 :
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants. Locate the position of element X in the periodic table.