551. Which one has maximum number of unpaired electrons ?
A. 6X
B. 7Y
C. 9Z
D. 13W

552. Molecular orbitals are filled according to _________________?
A. Auf bau principle
B. Hunds rule
C. Paulis Exclusion principle
D. All these

553. Which one shows high %age of the ionic character ?
A. H2O
B. HF
C. HCI
D. HBr

554. Which of the following have their outer most shell complete in atomic form ?
A. Noble gases
B. Alkali metals
C. Coinage metals
D. Gun metals

555. energy of atom in compound is___________________?
EA. Higher than individual
B. Lesser than individual
C. No change
D. Impossible to predict

556. An atom loses or gains electrons to__________________?
A. Gain stability
B. Form a bond
C. Complete its outermost shell
D. all are accurate justifications

557. In a group ionic radius ?
A. Increases
B. Decreases
C. No change
D. Variable trend

558. Ionization energy in a period generally ___________________?
A. Increases
B. Decreases
C. No change
D. Variable trend

559. Elements having high I.P values are____________________?
A. Metals
B. Non metals
C. Liquids
D. Solids

560. In a period electronegativity from left to right_________________?
A. Increases
B. Decreases
C. Remain constant
D. Variable trend