Which ion below has a noble gas electron configuration? Li^2+ Be^2+ B^2+ C^2+ N^

Question

Which ion below has a noble gas electron configuration? Li^2+ Be^2+ B^2+ C^2+ N^2- Of the following, which gives correct order for atomic radius for Mg, Na, P, Si and Ar? Mg > Na > P > Si > Ar Ar > Si > P > Na > Mg Si > P > Ar > Na > Mg Na > Mg > Si > P > Ar Ar > P > Si > Mg > Na The central atom in violates the octet rule. Which of the following correctly represents the second ionization of calcium? Ca(g) rightarrow Ca^+ (g) + e^- Ca^+ (g) rightarrow Ca^2+ (g) + e^- Ca-(g) + e^- rightarrow Ca^2- (g) Ca^+ (g) + e^- rightarrow Ca^2+ (g) Ca^+ (g) + e^- rightarrow Ca(g) Alkaline earth metals have the smallest atomic radius in a given period form basic oxides form halides with the formula MX form exist as triatomic molecules Of the bonds C-C, C-C, and C=C, the C-C bond is strongest/shortest strongest/longest weakest/longest weakest/shortest intermediate in both strength and length Of the following elements, has the most negative electron affinity. S Cl Sc Br I is isoelectronic with argon and is isoelectronic with neon. Cl^-, F^+ Cl^-, Cl^+ F+, F^- Ne^-, Kr^+ Ne^-, Ar^+ Lattice energy is the energy required to convert a mole of ionic solid into its constituent ions in the gas phase the energy given off when gaseous ions combine to form mole of an ionic solid the energy required to produce one mole of an ionic compound from its constituent elements is their standard states the sum of ionization energies of the components in an ionic solid the sum of electron affinities of the components in an ionic solid The effective nuclear charge of an atom is primarily affected by inner electrons outer electrons nuclear charge electron distribution orbital radial probability

Explanation / Answer

11

a)

Li atomic number is 3

Li2+ means it looses two electrons so its atomic number is 3-2 = 1

atomic no 1 is for H which is not a noble gas

b)

Be atomic number is 4

but it is in +2 oxidation state so 4-2 = 2

atomic number 2 for He which is noble gas correct answer

c)

B2+

atomic no of B is 5

in +2 oxidation sate 5-2 = 3

which is lithium atomic atomic number and Li is not a noble gas.

d)

C2+

atomic no fo C is 6

in +2 oxidation state 6-2 = 4

which is Be atomic number and Be is not a noble gas

e)

N2-

atomic number if N is 7

but it is in 2- oxidation state

7+2 = 9

9 for fluorine atomic number and which is not a noble gas

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