Answer: both options A and D
Explanation:
Half filled and completely filled orbitals are more stable than any other configuration since they are more symmetrical and energy exchange Occurs readily.
So 4f^7& 4f^14 are more stable
Answer:
CHAPTER 2 ATOMS, MOLECULES, AND IONS Questions 16. ... A molecule has no overall charge (an equal number of electrons and protons are present). Ions ... The first sample of chloroform has a total mass of 12.0 g C + 106.4 g Cl + 1.01 g H ... SrF2 f. Al2Se3 g. K3N h. Mg3P2 72. a. mercury(I) oxide b. iron(III) bromide c.
Explanation:
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It is B, smoke and air pollution can stress the lungs and cause things like Respiratory distress if not wearing a proper mask. That is why in places with massive amounts of air pollution many people will wear face masks.