What is the wavelength light emitted when the hydrogen atom undergoes a transiti

Question

What is the wavelength light emitted when the hydrogen atom undergoes a transition form level n = 5 to level n = 2? a) 663 nm b) 833 nm c) 546 nm d) 521 nm e) 434 nm Which pair of species is isoelectronic? a) Ne and Ar b) Na^+ and K^+ c) K^+ and CI^- d) B^3+ and Ne e) Be^2+ and Na^+ Chemical reactions between nonmetals and nonmetals primarily involve a) interactions between protons. b) interactions between protons and electrons. c) interactions between protons, electrons, and neutrons. d) transfer of electrons. e) sharing of electrons. The larger the difference in electronegative, 1 the more ionic the bond the more covalent the bond a) 1 only b) 2 only c) 3 only d) 1 and 3 only e) 2 and 3 only

Explanation / Answer

10)OPTION C

in isoelectronic series more the positive charge smaller is the ion and more the negative charge larger is the ion.

11) OPTION E

1/wavelength = R [1/n12 -1/n22] Substituting n1 = 2 n2 = 5 and R = 1.09x107 we get wavelength = 434nm

12) OPtion C

K+ has (19-1) = 18 eelectrons and Cl- has (17+1) = 18e

13) OPTION D

metals and non-metals form bonds by transferring electrons

14) OPTION D

The larger the electronegativity difference the more polar bond (between non metals) and more ionic bond(between metal and no-metal) can be formed.

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