The element that corresponds to the electron configuration 1s 2 2s 2 2p 2 is ___

Question

The element that corresponds to the electron configuration 1s22s22p2 is ________.

lithium

beryllium

boron

nitrogen

carbon

2.5 points   

Question 21

How many total electrons are in the Li+ ion?

2

3

4

7

8

2.5 points   

Question 22

Of the following transitions in the Bohr hydrogen atom, the ________ transition results in the absorption of the highest-energy photon.

All transitions absorb photons of equivalent energy.

2.5 points   

Question 23

The charge on the copper ion in the salt CuO is ________.

+1

+2

+4

+3

+5

2.5 points   

Question 24

Using the VSEPR model, the molecular geometry of the central atom in CH4 is ________.

linear

trigonal planar

tetrahedral

bent

trigonal pyramidal

2.5 points   

Question 25

Which set of three quantum numbers (n, l, ml) corresponds to a 4s orbital?

4,0,1

4,0,2

4,0,0

4,1,0

4,1,1

2.5 points   

Question 26

The possible oxidation numbers for iron are +1 and +2.

True

False

2.5 points   

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+

2.5 points   

Question 31

The electron-domain geometry and molecular geometry of the nitrite ion are ________ and ________, respectively.

trigonal bipyramidal, trigonal planar

tetrahedral, trigonal pyramidal

trigonal bipyramidal,T-shaped

trigonal planar, bent

T-shaped, trigonal planar

2.5 points   

Question 32

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

2.5 points   

Question 34

The symbol for the spin magnetic quantum number is ________.

ms

n

l

ml

sm

2.5 points   

Question 35

Which one of the following atoms has the largest radius?

As

O

Sn

Cs

Ca

2.5 points   

Question 36

All of the following are ionic compounds except ________.

CH4

K2O

Be(OH)2

NiCl2

Sr3N2

2.5 points   

Question 37

52.62

56.14

55.70

55.40

55.74

2.5 points   

Question 38

The energy produced by the sun is the result of nuclear fusion.

True

False

2.5 points   

Question 39

Element M reacts with oxygen to form an oxide with the formula M2O. When M2O is dissolved in water, the resulting solution is basic. Element M could be ________.

calcium

bromine

oxygen

carbon

nitrogen

2.5 points   

Question 40

At maximum, an d-subshell can hold ________ electrons.

10

6

2

8

14

lithium

beryllium

boron

nitrogen

carbon

Explanation / Answer

20. The given electronic configuration is: 1s2 2s2 2p2

Total number of electrons = 6

Atomic number 6 corresponds to Carbon.

21. Li have atomic number 3 means 3 electrons.

Li+ ion is formed by removal of 1 electron.

So, there are total 2 electrons in Li+ ion.

22. In Bohr hydrogen atom transition, energy is absorbed when transition occurs from lower enrgy level to higher energy level.

So, n = 2 to n = 5 , transition results in the absorption of the highest-energy photon.

23. CuO.

We know that O have -2 charge.

Cu + O = 0

Cu - 2 = 0

Cu = +2

So, Charge on Cu ion = +2

24. In CH4, central atom C is sp3 hybridized.

Hence, the molecular geometry of the central atom in CH4 is tetrahedral.

25. For 4s orbital,

n = 4

We know for any s orbital, l = 0 and for l = 0 m = 0

So, the set of three quantum numbers is: 4 ,0 ,0

26. False.

Possible  oxidation numbers for iron are +2 and +3.

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