Q: Which of the following pairs are both isoelectronic and isotopic?

$^{40}_{20}Ca^{2+}$ \,\text{and}\, ^{40}_{18}Ar$

Q: If the charge of one proton is $1.60218 \times 10^{-19}\,\text{C}$, how many protons are required to produce a charge of $-2.0\,\text{C}$?

$1.25 \times 10^{19}$\,\text{protons}$

Q: Which of the following represents the correct atomic mass formula using isotopic masses and fractional abundances?

$\text{Atomic Mass} = (\text{Isotope Mass}_1 \times \text{Fractional Abundance}_1) + (\text{Isotope Mass}_2 \times \text{Fractional Abundance}_2)$

Q: Which of the following choices has the greatest atomic mass?

Element D (4.14 \times 10^26 Da)

Question 1

Which subatomic particle is responsible for the positive charge of the nucleus in an atom?

Accepted Answer

Proton

Question 2

An atom of calcium-43 ($^{43}_{20}Ca$) has how many neutrons?

Accepted Answer

23

Question 3

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 4

A cation is formed when an atom:

Accepted Answer

Loses electrons

Question 5

Which of the following pairs are both isoelectronic and isotopic?

Accepted Answer

$^{40}_{20}Ca^{2+}$ \,	ext{and}\, ^{40}_{18}Ar$

Question 6

What is the atomic mass of lithium if its two naturally occurring isotopes have masses of 6.015122 amu (7.59%) and 7.016004 amu (92.41%)?

Accepted Answer

$6.941\,	ext{amu}$

Question 7

Which of the following elements has the greatest atomic mass?

Accepted Answer

Cs

Question 8

If the charge of one proton is $1.60218 	imes 10^{-19}\,	ext{C}$, how many protons are required to produce a charge of $-2.0\,	ext{C}$?

Accepted Answer

$1.25 	imes 10^{19}$\,	ext{protons}$

Question 9

Which of the following is the correct symbol for an ion with a +4 charge, 30 neutrons, and 21 electrons?

Accepted Answer

$^{55}Mn^{4+}$

Question 10

Which force is responsible for holding protons and neutrons together in the nucleus?

Accepted Answer

Nuclear force

Question 11

A neutral atom of $^{59}_{27}Co$ has how many electrons?

Accepted Answer

27

Question 12

Which of the following statements is FALSE?

Accepted Answer

The nucleus has an overall neutral charge.

Question 13

What is the percent abundance of Iron-56 if Iron-54 has a mass of 53.939615 amu, Iron-56 has a mass of 55.934942 amu, and the average atomic mass of iron is 55.845 amu?

Accepted Answer

91.75%

Question 14

Which of the following is the correct number of subatomic particles for $^{88}_{38}Sr$?

Accepted Answer

38 protons, 50 neutrons, 38 electrons

Question 15

Which of the following answers gives the correct number of subatomic particles for $^{34}_{16}S$?

Accepted Answer

16 protons, 18 neutrons, 16 electrons

Question 16

Which of the following represents the correct atomic mass formula using isotopic masses and fractional abundances?

Accepted Answer

$	ext{Atomic Mass} = (	ext{Isotope Mass}_1 	imes 	ext{Fractional Abundance}_1) + (	ext{Isotope Mass}_2 	imes 	ext{Fractional Abundance}_2)$

Question 17

A metallic element has a mass number of 65 and 35 neutrons. The cation formed has 28 electrons. What is the symbol of the cation?

Accepted Answer

$^{65}Zn^{2+}$

Question 18

Which of the following choices has the greatest atomic mass?

Accepted Answer

Element D (4.14 	imes 10^26 Da)

Question 19

If the charge of one proton is $1.60218 	imes 10^{-19}\,	ext{C}$ and the charge of one electron is $-1.60218 	imes 10^{-19}\,	ext{C}$, what is the charge of 378 g of protons? (Mass of one proton $= 1.6726 	imes 10^{-24}\,	ext{g}$)

Accepted Answer

$3.62 	imes 10^5\,	ext{C}$

Atomic Structure, Isotopes, Ions, and Atomic Mass: General Chemistry Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards