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CHEM 101 Chapter 4 Newest Exam Questions with All Correct Answers

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CHEM 101 Chapter 4 Newest Exam Questions with All Correct Answers A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 makes up 75.8% of the sample, and the isotope Cl-37 makes up 24.3% of the sample. Which of the following statements is true? A) The atomic mass of chlo...

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  • September 17, 2024
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CHEM 101 Chapter 4 Newest Exam
Questions with All Correct
Answers

A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 makes up
75.8% of the sample, and the isotope Cl-37 makes up 24.3% of the sample. Which of
the following statements is true?

A) The atomic mass of chlorine will be less than 35.
B) The atomic mass of chlorine will be more than 37.
C) You cannot tell what the atomic mass will be.
D) The atomic mass will be between 35 and 37.
E) The atomic mass will be 24.3. - Answer-The atomic mass will be between 35 and 37

Which of the following is not true for atoms 13N, 14N, and 15N?
A) They all have the same mass number
B) They are isotopes
C) They all have the same atomic number
D) They all have 7 protons
E) They all have 7 electrons - Answer-They all have the same mass number

The maximum number of electrons that may occupy the third electron energy level is
___________.
A) 2
B) 8
C) 10
D) 18
E) 32 - Answer-18

What is the element with the electron arrangement 2,8,7?
A) Be
B) Cl
C) F
D) S
E) Ar - Answer-Cl

What is the electron arrangement for potassium (atomic number 19)?
A) 2,8,9
B) 2,8,7,2
C) 2, 10, 7

, D) 2,8,8,1
E) 2,8,6,3 - Answer-2,8,8,1

The number of electrons in the outer energy level of a neutral atom of boron (atomic
number 5) is _____________.
A) 2
B) 3
C) 5
D) 8
E) 10 - Answer-3

The electron arrangement of any particular atom shows ___________.

A) the number of isotopes possible.
B) a description of the shape of each electron energy level.
C) the number of electrons in each energy level.
D) a diagram of an atomic nucleus.
E) the maximum number of electrons each energy level can hold. - Answer-the number
of electrons in each energy level

The number of electron energy levels in a magnesium atom is ____________.
A) 1
B) 2
C) 3
D) 4
E) 5 - Answer-3

The number of valence electrons found in an atom of Group A is equal to
______________.
A) its atomic number
B) its mass number
C) its group number
D) eight
E) eight minus the group number - Answer-its group number

Valence electrons are electrons located ____________.
A) in the outermost energy level of an atom
B) in the nucleus of an atom
C) in the innermost energy level of an atom
D) throughout the atom
E) in the first three shells of an atom - Answer-in the outermost energy level of an atom

In an electron-dot symbol of an element, the dots are used to represent
________________.
A) all of the electrons in the atom
B) the valence electrons

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