Name two elements whose valencies are equal to their group number.
identify and name the metals out of the following elements whose electronic configurations are given below.
Write the atomic numbers of two elements X and Y having electronic configuration 2,8,2 and 2,8,6 respectively.
Account for the following: Elements of group 18 are called zerovalent
An element X belongs to group 2 and period 3 of the periodic table. The chemical formulae of its nitrate, sulphate and phosphate r..
Out of two elements, potassium and sodium, which one can lose electron easily? Give reason for your answer
Assertion : Sodium is an element of group 1 of the modern periodic table.
Reason : All the elements of group 1 of the modern perio..
Give an account of the process adopted by Mendeleev for the clarification of elements. How did he arrive at "periodic law"?
Two elements A and B belong to the 3rd period of modern periodic table and are in group 2 and 13 respectively.
X is an element of modern periodic table. It is surrounded by elements having atomic number 17, 34, 36 and 53.
What type of oxide would Eka-aluminium form?
Did Dobereiners triads also exist in the columns of Newlands octaves? Compare and find out
The possition of three elements X, Y and Z in the periodic table is given below.
(i) How does electronic configuration of an atom
(ii) which element has a total of three shells
The element of a period of the periodic table are given below in order, from left to right with one of its element missing.
(i) Two elements having valency 2
(ii) Two elements forming oxides
(iii) An element having numbers of electrons double
Which of the following elements belong to
(i) same period? (ii) same group
Explain giving reason.
Atoms of seven elements A, B, C, D, E, F and G have different number of electronic shells but have the same number of electrons in..
(i) In this ladder (figure) symbols of elements are jumbled up.
(ii) Arrange them in the order of their group also
(i) three elements that have a single electron
(ii) two elements that have two electrons
(iii) three elements with filled ou..
Why does silicon has valency 4 and chlorine 1?
Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 respectively.
An element Y has a total of three shells, with six electrons in its valence shell.
(i) Lithium, sodium and potassium are all metals that react with water
(ii) Helium is an unreactive gas and neon is a gas
Assertion : Electronegativity of flourine is
Reason : The electronegativity of the elements increases
The correct order of increasing acidic nature of
Besides gallium, which other elements have since been discovered that
(i) The modern periodic table has been evolved through the early attempt of
(ii) Name the scientist who first of all showed
By Considering their position in the periodic table, which one of the following
Write the correct increasing order of the atomic radii of O, F and N.
Use Mendeleevs periodic table to predict the formulae for
What were the limitations of Newlands Law of octaves?
Assertion : The elements of the same group
Reason : The elements of the same group have the different number
Which of the following statements about the modern periodic table is correct?
What were the limitations of Dobereiners classification?
Which of the following statements is not a correct statement
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide.
Which group of elements will form an acidic oxide?
(i) An element x has both the shells
(ii) In which group of the periodic table
(iii) Write its electronic configuration
The electronic configuration of an element X is 2, 8, 8, 2.
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