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Exam 5: Early Atomic Theory and Structure

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Question 21

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The combined number of protons and neutrons in an atom is known as its

A) atomic number.
B) mass number.
C) atomic mass.
D) molecular mass.

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Question 22

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The number of electrons in an atom of phosphorous-31 is

A) 9
B) 15
C) 16
D) 22

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Question 23

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Compare and contrast the mass,electrical charge,and location of the three major subatomic particles.

A substance has 13 protons,14 neutrons,and 13 electrons.Which isotope is it?

The number of protons and neutrons in an atom are added to find the atom's

Which contains the largest number of neutrons?

In isotopic notation mass number is represented by the superscript

What is the atomic number of sodium?

Models of the atom were proposed by Rutherford,Dalton,and Thomson.Which choice places them in the correct chronological order of their appearance?

Ions can be formed from atoms by losing or gaining electrons.Select the alternative that states the correct number of protons,neutrons,and electrons in .

Ions can be formed from atoms by losing or gaining electrons.Select the alternative that states the correct number of protons,neutrons,and electrons in .

What charge does an anion possess?

Define in simple terms the concept of natural abundance for the isotopes of any element and how it determines the average atomic masses of the elements.

Which isotope contains the same number of protons,neutrons,and electrons?

Dalton's atomic model states that all atoms are composed of protons,neutrons,and electrons.

Which isotope has the same number of protons,neutrons,and electrons?

Explain how Rutheford's gold foil experiment changed the model of the atom proposed by Thomson.

Sulfur occurs naturally as four isotopes: ³²S with a mass of 31.9721 amu,³³S with a mass of 32.9715 amu,³⁴S 33.9679 amu,and ³⁶S with a mass of 35.9671 amu.Based on the information that is given on the periodic table,which isotope is the most abundant?

How many protons are in a neutral atom of Ar-40?

Which contains the fewest neutrons?