Question

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1)Among the following, trends of ionic radii are correct is
a) F- > Na+ > Mg2+
b) Al3+> O2- >N3-
c) P3-> Al3+ <CI-
d) H-> H+ > He+

2) Atomic radii of fluorine and neon in Angstrom (Å) units are respectively given by
a) 0.72, 1.60
b) 1.60, 1.60
c) 0.72, 0.72
d) Both b and c

3). Which one of the following is the smallest in size?
a) N-
b) O
c) Na+
d) f-​

Answer 1

Answer:

FOR 1ST QUESTION WE GO BY RATIO OF Z/E

AND IONIC SIZE IS INVERSLY PROPORTIONAL TO Z/E

SO WHOSE Z/E IS less WILL BE BIGGER

AND WHOSE Z/E IS MORE WILL BE SMALLER

(Z=atomic no )(e=no. of electrons in the ion )

In second question OPTION IS A

because size of inert gases are greatest in their respective period

in third again go for z/e ratio and you will get the answer .