Arrange these elements in order of increasing atomic radius: Ca, Rb, S, Si, Ge,

Question

Arrange these elements in order of increasing atomic radius: Ca, Rb, S, Si, Ge, F Which are the larger species in the two pairs: Li and Li^+; O and O^2-? HClO_4 is a Ba(OH)_2 is a and NaNO_3 is a The blanks in the sentence above should be filled in with which of the respective classification ? What is the oxidation number of P in PO_3^3+? How many moles of nitrogen are formed when 101 g of KNO_3 decomposes according to the following reaction? The molar mass of KNO_3 is 101 g/mol. 4 KKO_3 (s) rightarrow 2K_2 O(s) + 2N_2 (g) + 5 O_2 (g) Which of the following is a nonpolar molecule with polar bonds? Which one of the following ionic compounds would have the highest lattice energy? Calculate the energy change when an electron moves hydrogen atom.

Explanation / Answer

Answer – 17) We are given the element Ca, Rb, S, Si, Ge and F and we need to arrange these elements in order of increasing the atomic radius.

We know in the periodic table in group from the top to bottom atomic radius increase and in the period there is from left to right atomic radius gets decreased, so order of the of increasing the atomic radius is as follow –

F < S < Si < Ge < Ca < Rb

So answer is – option number –a) F, S, Si, Ge, Ca, Rb

18) We are given two pairs and we need to determine the which species is larger – We know when element loss the electrons its decrease the atomic size and when element gain electrons then size of element gets larger than neutral one.

So A pair there is Li is larger than Li+ and in the B pair there is O2- is larger, so answer for this one is – c) Li and O2-

19) We know the HClO4 is strong acid and Ba(OH)2 is strong base and NaNO3 is neutral salt, so answer is not given option like strong acid, strong base , salt, so I think it is –e) Strong acid, weak base, salt.

20 ) We know the oxidation number calculation rules, so the charge on the element or compound is the other side of equal, means here

P + 3*O = 3- , We know O = -2

So, P + 3*-2 = 3-

P -6 = 3-

P = +3 , so answer is d) +3

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