Which of the following atoms contains the highest number of electrons in the outermost shell?

A. ₈O

B. ₁₀Ne

C. ₁₅P

D. ₁₉K

What is the electronic configuration of an element represented as 19₉X?

A. 1s ²2s² 2p ⁵

B. 1s²2s²3s²3p³

C. 1s² 2s² 2p ³3s²

D. 1s ²2s²2p ⁶3s²3p₆4s ₁

Pauli Exclusion Principle is related to

A. quantum numbers of electrons

B. reversiblility of equlibrium reactions

C. electronegativity values of elements

D. collision theory of reaction rates

Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?

A. 4f

B. 4p

C. 4d

D. 4s

Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore

A. S decays faster than Q

B. Q is twice as stable as S

C. Q emits fewer particles than S

D. S is more stable than Q

Calcium atom ionizes by

A. gaining two electrons

B. losing two electrons

C. sharing two electrons

D. gaining two protons

Which of the following properties increases down a group in the Periodic Table?

A. Atomic radius

B. Electronegativity

C. Electon affinity

D. Ionization energy

In the Periodic Table, the elements that loss electrons most readily belong to

A. Group 1 A

B. Group 11 A

C. Group 111 A

D. Group V11 A

Which of the following reactions is not feasible?

A. Cl₂ + 2Kl → 2KCI + I₂

B. Cl₂ + 2NaF → 2NaCI + F₂

C. Zn + CuCI₂ ZnCl₂ + Cu

D. Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag