Question

18. Read the following and answer any four questions from 18 (i) to 18 (v).
The metals like Na and Mg are towards the left-hand side of the Periodic Table while the
non-metals like sulphur and chlorine are found on the right-hand side. In the middle, we
have silicon, which is classified as a semi-metal or metalloid because it exhibits some
properties of both metals and non-metals.
In the Modern Periodic Table, a zig-zag line separates metals from non-metals. The
borderline elements boron, silicon, germanium, arsenic, antimony, tellurium and
polonium - are intermediate in properties and are called metalloids or semi-metals.
Metals tend to lose electrons while forming bonds, that is, they are electropositive in
nature.
As the effective nuclear charge acting on the valence shell electrons increases across a
period, the tendency to lose electrons will decrease. Down the group, the effective
nuclear charge experienced by valence electrons is decreasing because the outermost
electrons are farther away from the nucleus. Therefore, these can be lost easily. Hence,
metallic character decreases across a period and increases down a group.
(i) Three elements B, Si and Ge are :
(a) metals
(b) non-metals
(c) metalloids
(d) metal, non-metal and metalloid respectively.
(ii) 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?​

Answer 1

Answer:

Explanation:

estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation propertiesestival of electrons and atomic satori is a result of the law and conservation proestival of electrons and atomic satori is a result of the law and conservation propeestival of electrons and atomic satori is a result of the law and conservation proestival of electrons and atomic satori is a result of the law and conseestival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​estival of electrons and atomic satori is a result of the law and conservation properties​rvation properties​perties​rties​perties​​