How many isotopes has hydrogen?
A. 2 B. 3 C. 4 D. 5 Correct Answer: Option B B. 3Which of the following electrons configurations correctly represents an inert element?
A. 1s² 2s² 2p4 B. 1s² 2s² 2p6 3s² C. 1s2 2s² 2p6 3s² 3p4 D. 1s² 2s² 2p6 Correct Answer: Option D D. 1s² 2s² 2p6Which of the following ions has the electron configuration 2,8,8?
A. Na+ B. Mg2+ C. F- D. CI- Correct Answer: Option D B. Mg2+Which of the following substances is mainly responsible for the depletion of the ozone layer?
A. Oxygen B. Chlorofluorocarbon C. Carbon (ll) oxide D. Nitrogen (ll) oxide Correct Answer: Option B B. ChlorofluorocarbonBrass is a mixture of?
A. Cu and Sn B. Cu and Zn C. Cu and Mg D. Cu and Pb Correct Answer: Option B B. Cu and ZnProducts
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