Modern Periodic Table

Question 0

A period

Answer 0

A period is a horizontal row of elements in the periodic table. Elements show trends in properties across a period.

Question 1

Periodicity

Answer 1

Periodicity is a regular periodic variation of properties of elements with atomic number and position in the periodic table.

Question 2

Colour of chlorine in water?in cyclohexane?and colour of chloride ion?

Answer 2

In water and in cyclohexane chlorine is pale-green. A chlorine ion is colourless.

Question 3

What is the colour of bromine in water?in cyclohexane?and as a bromine ion?

Answer 3

In both water and cyclohexane bromine is orange. Bromine ion is colourless.

Question 4

What colour is iodine in water?in cyclohexane?as an ion?

Answer 4

Iodine is brown in water and violet in cyclohexane and is colourless as an ion.

Question 5

A displacement reaction.

Answer 5

A displacement reaction is a reaction in which a more-reactive element displaces a less-reactive element from an aqueous solution of the latters ions.

Question 6

What is disproportionation?

Answer 6

Disproportionation is the oxidation and reduction of the same element in a redox reaction.

Question 7

A precipitation reaction

Answer 7

A precipitation reaction is the formation of a solid from a solution during a chemical reaction. Precipitates are often formed when to aqueous solutions are mixed together.