Chem 120 Exam Questions with correct
answers
How many elements have been discovered?
A. Less than 50
B. Less than 100
C. More than 100
D. More than 200 - Correct answer C. More than 100
How many rows of elements are there in the periodic table of elements?
A. 5
B. 8
C. 4
D. 7 - Correct answer D. 7
Any atom is consisted of?
A. Electrons and protons in the nucleus and neutrons in orbitals surrounding the nucleus
B. Electrons and neutrons in the nucleus, and protons in orbitals surrounding the nucleus
C. Electrons in the nucleus, and protons and neutrons in orbitals surrounding the nucleus
D. Protons and neutrons in the nucleus, and electrons in orbitals surrounding the nucleus - Correct
answer D. Protons and neutrons in the nucleus, and electrons in orbitals surrounding the nucleus
What is true about the number of protons and electrons in an atom?
A. they are equal
B. the number of electrons equals the sum of the number of protons and neutrons
C. They are not related
D. The sum of the numbers of electrons and protons equals to the number of neutrons - Correct answer
A. they are equal
Which group of elements does oxygen belong to?
, A. Group IA
B. Group VIB
C. Group VIIA
D. Group IVA
E. None of the above - Correct answer E. None of the above
Among all elements, which has the largest electronegativity?
A. C
B. O
C. He (helium)
D. F
E. Fr (Francium) - Correct answer D. F
Do electronegativities of elements in a row of the element table follow a trend? If yes, describe the
trend.
A. Yes, they decrease from left to right
B. Yes they increase from left to right
C. No trend
D. Yes for some rows, no for other rows - Correct answer B. yes, they increase from left to right
Ho many subtle an atom can have in its second shell of electrons? And what are they?
A. Two. They are s and p
B. Eight they are #1 thru #8
C. Four. They are a, b, c, and d
D. Three. They are d, f, and p - Correct answer A. Two. They are s and p
Arrange the following orbitals in the order of increasing energy.
1s, 2p, 3s, 3p
A. 1s, 2p, 3s, 3p
answers
How many elements have been discovered?
A. Less than 50
B. Less than 100
C. More than 100
D. More than 200 - Correct answer C. More than 100
How many rows of elements are there in the periodic table of elements?
A. 5
B. 8
C. 4
D. 7 - Correct answer D. 7
Any atom is consisted of?
A. Electrons and protons in the nucleus and neutrons in orbitals surrounding the nucleus
B. Electrons and neutrons in the nucleus, and protons in orbitals surrounding the nucleus
C. Electrons in the nucleus, and protons and neutrons in orbitals surrounding the nucleus
D. Protons and neutrons in the nucleus, and electrons in orbitals surrounding the nucleus - Correct
answer D. Protons and neutrons in the nucleus, and electrons in orbitals surrounding the nucleus
What is true about the number of protons and electrons in an atom?
A. they are equal
B. the number of electrons equals the sum of the number of protons and neutrons
C. They are not related
D. The sum of the numbers of electrons and protons equals to the number of neutrons - Correct answer
A. they are equal
Which group of elements does oxygen belong to?
, A. Group IA
B. Group VIB
C. Group VIIA
D. Group IVA
E. None of the above - Correct answer E. None of the above
Among all elements, which has the largest electronegativity?
A. C
B. O
C. He (helium)
D. F
E. Fr (Francium) - Correct answer D. F
Do electronegativities of elements in a row of the element table follow a trend? If yes, describe the
trend.
A. Yes, they decrease from left to right
B. Yes they increase from left to right
C. No trend
D. Yes for some rows, no for other rows - Correct answer B. yes, they increase from left to right
Ho many subtle an atom can have in its second shell of electrons? And what are they?
A. Two. They are s and p
B. Eight they are #1 thru #8
C. Four. They are a, b, c, and d
D. Three. They are d, f, and p - Correct answer A. Two. They are s and p
Arrange the following orbitals in the order of increasing energy.
1s, 2p, 3s, 3p
A. 1s, 2p, 3s, 3p
