Periodicity

Question 1

Arranged the elements in TRIADS like Li-Na-K, Ca-Sr-Br and Cl-Br-I

Answer 1

Johann Wolfgang Dobereiner

Question 2

Arranged the elements in ATOMIC MASS and found out that every eight element has similar properties

Answer 2

John AR Newlands

Question 3

Arranged the elements in the periodic table according to their recurring periodic element

Answer 3

Dmitri Mendeleev

Question 4

Discovered the relationship between the elements atomic number and the frequency of x-rays generated by bombarding the element with high energy electrons

Answer 4

Henry Moseley

Question 5

It states that “The properties of the elements are functions of their atomic numbers “

Answer 5

The Modern Periodic Law

Question 6

Ability or tendency of an atom TO ATTRACT the shared pair of electron toward itself

Answer 6

Electronegativity

Question 7

Energy required TO REMOVE an electron from a gaseous atom in its ground state

Answer 7

Ionization Energy

Question 8

Change in energy when electron is accepted (or added) by a gaseous atom to form anion

Answer 8

Electron Affinity

Question 9

Average distance between the nucleus and valence electron

Answer 9

Atomic radius

Question 10

Same number of electrons

Answer 10

Isoelectronic

Question 11

Are compounds form between hydrogen and the most active elements, especially with the alkali and alkaline-earth metals of group one and two elements

Answer 11

Ionic Hydrides

Question 12

TRUE or FALSE

The more electronegative the central atom, the more acidic the oxide

Answer 12

TRUE