Calcium atom ionizes by?
A. gaining two electrons B. losing two electrons C. sharing two electrons D. gaining two protons Correct Answer: Option B – losing two electrons
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 Correct Answer: Option D – S is more stable than Q
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
A. 4f B. 4p C. 4d D. 4s Correct Answer: Option D – 4s
What is the electronic configuration of an element represented as 19 9X?
A. 1s² 2s² 2p5 B. 1s² 2s² 3s² 3p³ C. 1s² 2s² 2p³ 3s² D. 1s² 2s² 2p6 3s² 3p6 4s¹ Correct Answer: Option A – 1s² 2s² 2p5
Which of the following atoms contains the highest number of electrons in the outermost shell?
A. 😯 B. 10Ne C. 15P D. 19K Correct Answer: Option B – 10NeProducts
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