Question

Q5. Define the following.
a) relative density
b) ductility
c) valence electrons​

Answer 1

Answer:

a)the ratio of the density of a substance to the density water at 4°C

b)Ductility is when a solid material stretches under tensile strain

c) Valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond

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Answer 2

Answer:

Explanation:

Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity for liquids is nearly always measured with respect to water at its densest (at 4 °C or 39.2 °F); for gases, the reference is air at room temperature (20 °C or 68 °F).

Ductility is a measure of a material's ability to undergo significant plastic deformation before rupture or breaking, which may be expressed as percent elongation or percent area reduction from a tensile test.

The presence of valence electrons can determine the element's chemical properties, such as its valence—whether it may bond with other elements and, if so, how readily and with how many. In this way, a given element's reactivity is highly dependent upon its electronic configuration. For a main group element, a valence electron can exist only in the outermost electron shell; for a transition metal, a valence electron can also be in an inner shell.