Question 27 Of the following elements, ________ has the most negative electron a

Question

Question 27

Of the following elements, ________ has the most negative electron affinity.

F

Cl

Br

H

I

2.5 points   

Question 28

An atom of 13C contains ________ protons.

6

19

7

9

13

2.5 points   

Question 29

Of the following atoms, which has the largest first ionization energy?

K

Rb

Sr

Ca

Ba

2.5 points   

Question 30

The ion with the smallest diameter is ________.

Li+

Na+

K+

Rb+

Cs+

There are ______ covalent bonds in the Lewis Structure of CH3CHCl2.

7

6

8

5

4

2.5 points   

Question 33

Of the molecules below, only ________ is nonpolar.

PF3

Br2S

TeCl2

HCl

BeH2

F

Cl

Br

H

I

Explanation / Answer

27. Of the given elements, Cl has the most negative electron affinity i.e, - 349 kJ/mol.

28. An atom of 13C has mass number = 13

It is an isotope of Carbon having mass number = 13 and atomic number = 6.

So number of protons = 6

29. Of the given atoms, Ca has the largest first ionization energy due to to its smaller size compared to other atoms.

30. The ion with the smallest diameter is Li+. because ionic radius decrease as we move bottom to top in a group.

31. The lewis structure of CH3CHCl2 have:

4 C-H bonds , 1 C-C bond and 2 C-Cl bonds

So there are total 7 covalent bonds.

33. Of the given molecules, BeH2 molecule is linear. Bonds are polar but equivalent force acting on Be with 180o angle is zero, so molecule is nonpolar.

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