Which of the following is a favourable factor for cation formation
A. High electronegativity
B. High electron affinity
C. Low ionisation potential
D. Smaller atomic size
Identify the correct order in which the covalent radius of the following elements increasesI. TiII. CaIII. Sc
A. I, II, III
B. III, II, I
C. II, I, III
D. I, III, II
In the long form of periodic table, the elements having lowest ionisation potential are present in :
A. I group
B. IV group
C. VIE group
D. Zero group
Al3+ion has a lower ionic radius than Mg2+ ion because :
A. Mg atom has less number of neutrons than Al.
B. Al3+ has a higher nuclear charge than Mg2+
C. their electronegativities are different
D. Al has a lower ionisation potential than Mg atom
An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to
A. II group
B. IV group
C. VIII group
D. zero group
Observe the following statements :I. The physical and chemical properties of elements are periodic functions of their electronic configuration.II. Electronegativity of fluorine is less than the electronegativity of chlorine.III. Electropositive nature decreases from top to bottom in a group.The correct answer is :
A. I, II and III are correct
B. only I is correct
C. only I and II is correct
D. only II and III are correct
Which one of the following order is correct for the first ionization energies of the elements
A. B < Be < N < O
B. Be < B < N < O
C. B < Be < O < N
D. B < O < Be < N
The order of decrease in atomic radii for Be;Na;Mg is
A. Na>Mg>Be
B. Mg>Na>Be
C. Be>Na>Mg
D. Be>Mg>Na
Let electronegativity, ionisation energy and electron affinity be represented as EN, IP and EA respectively. Which one of the following equation is correct according to Mulliken?
A. EN = IP x EA
B. EN = IP / EA
C. EN = (IP + EA) / 2
D. EN = IP - EA