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Question 15 Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si and Ar? Na> Mg > Si > P> Ar M
Question 14 Which of the following pairs is isoelectronic? S and Ne Na and Ne Li and K oland a
Question 13 Select the correct electron configuration for Ag. [Kr]55-4d10 O [Kr]5524p6403 [Kr|4410 O [kr]5240
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Answer 15- Na > Mg > Si > P > Ar is correct order of decreasing atomic size, because size of atom decreases on going left to right in periodic table due to increase in effective nuclear charge.

Answer 14- Na+ and Ne are isoelectronic species because Na+ is 10 elecrons specie and Ne is also 10 electrons specie. And isoelectronic are those species (atoms)or molecules or ions; having same number of electrons in them.

Answer 13- [Kr] 5s¹ 4d¹° is correct electronic configuration of silver (Ag). Since electronic configuration of Ag is exceptional case in which one electron of 5s-orbital shift to 4d-orbital to gain more stability (i.e. 4d10 , completely filled d orbital is more stable).

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