Lesson 1: Definations

Question 1

Modern Periodic Law

Answer 1

Physical and chemical properties of elements are the periodic functions of their atomic number.

Question 2

Periodicity

Answer 2

Periodicity in properties refers to the occurrence of characteristic properties of elements at definite intervals in the Modern Periodic Table.

Question 3

Periodic properties

Answer 3

The properties that appear at regular intervals in the Modern Periodic Table are called periodic properties.

Question 4

Atomic Radius

Answer 4

The atomic radius of an atom is the distance between the centre of the nucleus and the outermost shell of the atom.

Question 5

Ionisation Potential

Answer 5

Ionisation potential is the amount of energy required to remove an electron from the outermost shell of an isolated gaseous atom.

Question 6

Electron Affinity

Answer 6

Electron affinity is the amount of energy released when a gaseous atom accepts an electron to form an anion.

Question 7

Electronegativity

Answer 7

Electronegativity is the tendency of an atom to attract electron towards itself when combined in a compound.

Question 8

Nuclear Charge

Answer 8

The nuclear charge of an atom is the positive charge on the nucleus of the atom.

Question 9

Bridge Elements

Answer 9

Bridge elements are those elements of the second period that show similarities in properties diagonally with the elements of the next group of the third period.