The molecular shape shown in the following figure is bent. tetrahedral. trigonal

Question

The molecular shape shown in the following figure is

bent.

tetrahedral.

trigonal planar.

trigonal pyramidal.

2 points   

Question 2

The Ca+2 ion is larger than the Ca atom.

True

False

2 points   

Question 3

Which of the following atoms has the largest radius?

S

Te

O

Se

2 points   

Question 4

An S2– ion has an electron configuration similar to that of

selenium.

argon.

chlorine.

krypton.

2 points   

Question 5

The atomic radius generally decreases as we move from left to right across a period because

the number of electrons in the atoms decreases from left to right.

the number of protons in the nucleus increases from left to right.

the number of neutrons in the nucleus remains almost constant as we move from leftto right.

the sizes of the orbitals in the energy level decreases as we move from left to right.

2 points   

Question 6

How many sublevels are occupied in an atom of magnesium in the ground state?

4

2

3

5

2 points   

Question 7

The shape of a boron trifluoride molecule is

tetrahedral.

linear.

trigonal planar.

pyramidal.

2 points   

Question 8

As one progresses left to right across a period on the periodic table, electronegativity generally

increases.

decreases.

remains the same.

2 points   

Question 9

What is the maximum number of electrons that can occupy the third principal energy level?

6

2

8

18

2 points   

Question 10

Carbon dioxide is a nonpolar molecule because

the carbon-oxygen bonds are polar covalent.

the two oxygen atoms are bonded to the carbon atom.

the individual dipoles of the carbon-oxygen bonds are oriented 180° to each other.

oxygen is more electronegative than carbon.

2 points   

Question 11

How many valence electrons are present in an atom of cesium in the ground state?

2

3

1

7

2 points   

Question 12

In the third principal energy level, which sublevel contains electrons with the greatest energy?

3f

3d

3s

3p

2 points   

Question 13

A bond that is principally ionic will form between

phosphorus and sulfur.

sulfur and hydrogen.

potassium and fluorine.

chlorine and iodine.

2 points   

Question 14

Which of the following regions of the electromagnetic spectrum has the longest wavelength?

infrared

microwave

gamma ray

ultraviolet

2 points   

Question 15

Which of the following statements is true for most atoms?

In general, as the atomic radius increases, the first ionization energy decreases.

In general, as the atomic radius increases, the first ionization energy increases.

No correct answer is given.

In general, as the first ionization energy decreases, the electronegativity increases.

2 points   

Question 16

Which of the following corresponds to the excited state configuration for a boron atom?

1s22s23s1

1s22s32p2

1s22s22p1

1s32s2

2 points   

Question 17

Which of the following contains both ionic and covalent bonds?

[NO2]–

KNO3

NH3

KCl

2 points   

Question 18

Which element forms an ion that is smaller than its atom?

sulfur

fluorine

oxygen

lead

2 points   

Question 19

What is the total number of valence electrons in a molecule of ammonia?

6

24

3

8

2 points   

Question 20

The series Ba, Cs, P, and O is arranged by decreasing atomic size.

True

False

2 points   

Question 21

As one progresses from top to bottom of a group on the periodic table, atomic radius generally

increases.

remains the same.

decreases.

2 points   

Question 22

Which of the following would require the largest amount of energy to remove the third electron?

Mg

Na

Al

Si

2 points   

Question 23

Which scientist developed the idea that electrons exist in specific regions at various distances from the nucleus?

Thomson

Bohr

Rutherford

Dalton

2 points   

Question 24

A nonpolar covalent bond will form between which two atoms as shown in the following combinations?

sodium and bromine

potassium and chlorine

hydrogen and chlorine

chlorine and chlorine

2 points   

Question 25

Which of the following characterizes covalent bonding?

loss of electrons

formation of ions

type of bond normally found between metals and nonmetals

formation of true, discrete molecules

A.

bent.

B.

tetrahedral.

C.

trigonal planar.

D.

trigonal pyramidal.

Explanation / Answer

2)

Ca+2 ion has lesser electrons than Ca atoms

so Ca+2 ion is smaller than Ca tom

so

the answer is false

3)

radius increase down the group

so

Te has the largest radius

so

the answer is B) Te

4)

answer is B) argon

5)

B) the number of protons in the nucleus increases from left to right.

6)

magnesium in ground state is 1s2 2s2 2p6 3s2

so

3 - S sublevels and 1 P sub level

so

total 4 sub levels

so

the answer is A) 4

7)

C) trigonal planar

8)

A) increases

9)

maximum electrons = 2n2

in this case , n= 3

so

maximum electrons = 2 x (3)^2 = 2 x 9 = 18

so

the answer is D) 18

10)

we know that

C02 is linear

the shape is 0=C=0

so

the answer is

C) the individual dipoles of the carbon-oxygen bonds are oriented 180° to each other.

11)

we know that

ground state configuration of Cesium is [Xe] 6s1

so

only 1 valence electron

so

the answer is C) 1

12)

B) 3d

13)

C) potassium and fluorine

14)

the answer is B) microwave

15)

we know that

as atomic radius increases , ionization energy decreases

so the answer is A

16)

boron ground state ---> 1s2 2s2 2p1

now

s sublevel can only hold 2 electrons

so

the answer is A) 1s2 2s2 3s1
17)

the answer is B) KN03

18)

to form an ion smaller than its atom

then it should form an cation , positively charged ion

so the answer is D) lead

19)

5 from N atom

3 from 3 H atoms

so

total = 5 + 3 = 8

so

the answer is

D) 8

20)

the order is Cs > Ba > P > 0

so

the given order is false

21) A) increases

22)

A) Mg

23)

B) bohr

24)

non polar colvanet bonds formed between same atoms

so

the answer is D) chlorine and chlorine

25)

D) formation of molecules

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