16) The correct order of atomic radii is given by, K > Ca > Ge > As > Kr Because

Question

16)

The correct order of atomic radii is given by,

K > Ca > Ge > As > Kr

Because all the elements are present in the same period and their atomic number increses. The number of electrons are added to same shell with respect to the atomic number.

hence Answer : D

17)

The correct set of isoelectronic species is given by,

O2- , F-, Ne, Na+

Isoelectronic species means the species have same number of electron in their valance shell. The electronic configuration of the species given as follows.

O - 1s2 2s2 2p4

O2- - 1s2 2s2 2p6

F - 1s2 2s2 2p5

F- - 1s2 2s2 2p6

Ne - 1s2 2s2 2p6

Na - 1s2 2s2 2p6 3s1

Na+ - 1s2 2s2 2p6

Hence Answer : E

18)

The correct order is given by,

Ne > N > O > Be > B

Ionization energy is the minimum energy required to remove an electron from the valance shell of isolated gaseous atom.

Ne - 1s2 2s2 2p6 has stable octet configuration so it has highest first ionization energy.

N - 1s2 2s2 2p3 has half filled stable configuration hence it has more value compare with oxygen.

O - 1s2 2s2 2p4 by loosing of one electron it will get half filled configuration so it has lower value compare to Nitrogen

Be - 1s2 2s2 has half filled stable sub shell configuration hence it has more value compare with Boron.

B - 1s2 2s2 2p1 by loosing of one electron it will get half filled sub shell configuration so it has lower value compare to Nitrogen

Hence Answer : D

19)

O (g) -----> O+ (g) + e-

20)

Electron affinity the energy change when an electron added to an isolated gaseous atom.

so the equation is given by,

Ca (g) + e- ----> Ca-(g)

Hence Answer : A

Explanation / Answer

E) Br, I, At 16. Of the following, which gives the correct order for atomic radius for Ca, K, As, Ge and Kr? A) Ca> K> As >Ge> Kr B) Kr> Ge> As > K> Ca C) Ge > As > Kr> K> Ca -D) K> Ca > Ge> As > Kr Kr > As > Ge > Ca > K 17. Which of the following is an isoelectronic series? A) B5-, Si4-, As3-, Te2- F-, Cl-, Br, I- ) S, Cl, Ar, K D) si2-, P2-, s2-, c12- E02, F-, Ne, Nat 18. Rank the following in terms of decreasing first ionization energies? A) Ne> O>N>Be>B B) Ne > N>O> B> Be Ne >O>N> B> Be, D) Ne > N O>Be> B E) B> Be>O>N> Ne

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