Solutions? f ns2 10) Which group of element all have a valence shell electron co

Question

Solutions? f ns2 10) Which group of element all have a valence shell electron configuration o A) Li, Be, B B) Mg, Ca, Sr C) Li, Na, Rb D) C, Si, Ge 11) Which reaction below represents the second ionization of P? B)P"(g) + e- C)P+(g) D)P (g) P-2(g) P"(g) +e P"(g) +e 12) Given the following two waves below. Which statement is true. X. A) The wavelength of wave X is greater than the wavelength of wave Y B) The frequency of wave X is greater than the frequency of wave Y C) The amplitude of wave X is greater than the amplitude of wave Y D) The amplitude of wave Y is greater than the amplitude of wa ve X 13) (T/F) Linus Pauling suggested that light could be viewed as a stream of particles called photons whose energy depends on their frequency A) True B) False

Explanation / Answer

10)

Answer:- B (Mg, Ca, Sr)

Li has configuration 1s2 2s1

so, A and C options are wrong.

And Carbon has 1s2 2s2 2p2

so, option D also wrong

Where as Mg :- 1s2 2s2 2p6 3s2 , Ca:- 1s2 2s2 2p6 3s2 3p6 4s2 and Sr :- [Kr]5s2

11)

Answer :- C ( P+ + energy = P2+ + 1e-)

second ionization means losing or gaining second most valence electron. Option A and D are dealing with last valence electron so those two are wrong. And P is most likely loose electrons instead of gaining so, option B is wrong.

12)

Answer :- B

Both are sinusoidal waves and for sine waves wavelength is the distance between any two successive crests or troughs. And it is greater in Y . so option A is wrong. And Amplitude is the height of any crest or depth of any trough but we do not provide hights or depths of both waves so C,D options cannot be commented.

And frequency is inversily proportional to wavelength. i.e., frequency = velocity of light /wavelength. ==> so less the wavelength more frequency. ==> option B is right option.1

13)

Answer :- False

This theory has been proposed by Einstein.

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