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Chemistry Questions

Question 2551:

What is the electronic configuration of an element represented as 19<sub style='font-size: smaller;'>9</sub>X?

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A 1s <sup style='font-size: smaller;'>2</sup>2s<sup style='font-size: smaller;'>2</sup> 2p <sup style='font-size: smaller;'>5</sup>
B 1s<sup style='font-size: smaller;'>2</sup>2s<sup style='font-size: smaller;'>2</sup>3s<sup style='font-size: smaller;'>2</sup>3p<sup style='font-size: smaller;'>3</sup>
C 1s<sup style='font-size: smaller;'>2</sup> 2s<sup style='font-size: smaller;'>2</sup> 2p <sup style='font-size: smaller;'>3</sup>3s<sup style='font-size: smaller;'>2</sup>
D 1s <sup style='font-size: smaller;'>2</sup>2s<sup style='font-size: smaller;'>2</sup>2p <sup style='font-size: smaller;'>6</sup>3s<sup style='font-size: smaller;'>2</sup>3p<sub style='font-size: smaller;'>6</sub>4s <sub style='font-size: smaller;'>1</sub>

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Question 2552:

Pauli Exclusion Principle is related to

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A Quantum numbers of electrons
B Reversiblility of equlibrium reactions
C Electronegativity values of elements
D Collision theory of reaction rates

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Question 2553:

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

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A 4f
B 4p
C 4d
D 4s

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Question 2554:

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

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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

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Question 2555:

Calcium atom ionizes by

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A Gaining two electrons
B Losing two electrons
C Sharing two electrons
D Gaining two protons

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