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Periodic Classification of Elements

Properties of the elements are given below. Where would you locate the following elements in the periodic table?
(a) A soft metal stored under kerosene
(b) An element with variable (more than one) valency stored under water.
(c) An element which is tetravalent and forms the basis of organic chemistry
(d) An element which is an inert gas with atomic number 2
(e) An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “ anodising”

06/11/2024

Science

10th

Periodic Classification of Elements

Identify the elements with the following property and arrange them in increasing order of their reactivity
(a) An element which is a soft and reactive metal
(b) The metal which is an important constituent of limestone
(c) The metal which exists in liquid state at room temperature

06/11/2024

Science

10th

Periodic Classification of Elements

Arrange the following elements in the increasing order of their metallic character
Mg, Ca, K, Ge, Ga

06/11/2024

Science

10th

Periodic Classification of Elements

Write the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17).
Draw its electronic dot structure. What is the nature of the bond formed?

06/11/2024

Science

10th

Periodic Classification of Elements

Identify and name the metals out of the following elements whose electronic configurations are given below.
(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
(d) 2, 1

06/11/2024

Science

10th

Periodic Classification of Elements

Arrange the following elements in increasing order of their atomic radii.
(a) Li, Be, F, N
(b) Cl, At, Br I

06/11/2024

Science

10th

Periodic Classification of Elements

Compare the radii of two species X and Y. Give reasons for your answer.
(a) X has 12 protons and 12 electrons
(b) Y has 12 protons and 10 electrons

06/11/2024

Science

10th

Periodic Classification of Elements

If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?

06/11/2024

Science

10th

Periodic Classification of Elements

Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.

06/11/2024

Science

10th

Periodic Classification of Elements

Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.

06/11/2024

Science

10th