Which of these elements has the most favorable (most negative) electron affinity

Question

Which of these elements has the most favorable (most negative) electron affinity? A)N B) Ne C) Ca D)S Photochemists use electromagnetic radiation to initiate chemical reactions, often by providing the energy required to break bonds within a molecule. Increasing which of the following will result in electromagnetic radiation having less energy per photon? A) frequency B) intensity C) amplitude D) wavelength Which ion has the smallest ionic radius? A) CI^- B) F^- C) Br^- D) I^- Which element has the most favorable (most negative) electron affinity? A)C B) Li C)B D)N The four lines observed in the visible emission spectrum of hydrogen tell us that A) The hydrogen molecules they came from have the formula H_4. B) We could observe more lines if we had a stronger prism. C) There are four electrons in an excited hydrogen atom. D) Only certain energies are allowed for the electron in a hydrogen atom. How many orbitals are there in the fourth (n=4) shell? A) 9 B) 8 C) 12 D) 16 What is the ground-state valence-shell electron configuration of the group of elements indicated by the shaded portion of the periodic table? A) ns^2 B) ns^2np^2 C) ns^2(n - 1)d^2 D) ns^2(n - 2)f^2

Explanation / Answer

16. A. N

nitrogen electronegativity is 3

17. B

18. Cl-

in a group top to bottom ionic radius is increases.Cl- has small radius

19. D . N

nitrogen has more electronegativity

20.

21. no of orbital = n2   = 42 = 16

22. ns2

IIA group elements

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