Q: Which of the following atoms or ions has the greatest number of neutrons?

$\mathrm{I^-}$ \text{ with mass number } 127$

Question 1

A neutral atom of chlorine ($\mathrm{Cl}$) has an atomic number of 17 and a mass number of 35. How many protons, neutrons, and electrons does it contain?

Accepted Answer

17 protons, 18 neutrons, 17 electrons

Question 2

An atom of tungsten ($\mathrm{W}$) has 74 protons and 72 electrons. What is its charge, and is it a cation, anion, or neutral?

Accepted Answer

Charge: $+2$, cation

Question 3

Which of the following correctly describes the relationship between atomic number ($Z$), mass number ($A$), and the number of neutrons ($N$) in an atom?

Accepted Answer

$N = A - Z$

Question 4

A sulfur atom ($\mathrm{S}$) has 16 protons, 17 neutrons, and 16 electrons. What is its atomic number, mass number, and charge?

Accepted Answer

Atomic number: 16, Mass number: 33, Charge: 0

Question 5

Which of the following atoms or ions has exactly 36 electrons?

Accepted Answer

$\mathrm{Br^-}$

Question 6

If an atom has 33 protons, 40 neutrons, and 36 electrons, what is its atomic symbol and charge?

Accepted Answer

$\mathrm{As^{3-}}$

Question 7

Which of the following is a correct chemical symbol for an atom with 53 protons, 74 neutrons, and 54 electrons?

Accepted Answer

$\mathrm{I^-}$

Question 8

A neutral atom of calcium ($\mathrm{Ca}$) has an atomic number of 20. If it loses two electrons, what is its resulting charge and chemical symbol?

Accepted Answer

$\mathrm{Ca^{2+}}$

Question 9

Which of the following ions is isoelectronic with argon ($\mathrm{Ar}$)?

Accepted Answer

$\mathrm{Cl^-}$

Question 10

A sample contains 10 protons, 10 neutrons, and 10 electrons. What is the atomic symbol and charge of this atom?

Accepted Answer

$\mathrm{Ne}$, charge $0$

Question 11

Which of the following atoms or ions has the greatest number of neutrons?

Accepted Answer

$\mathrm{I^-}$ 	ext{ with mass number } 127$

Question 12

Which of the following statements about ions is correct?

Accepted Answer

An anion has more electrons than protons.

Question 13

A patient is found to have a high concentration of $\mathrm{K^+}$ ions in their blood. What does the $+$ sign indicate about the potassium ion?

Accepted Answer

It has lost one electron compared to the neutral atom.

Question 14

Which of the following elements is most likely to form a $2^-$ anion?

Accepted Answer

Sulfur ($\mathrm{S}$)

Question 15

A neutral atom of bromine ($\mathrm{Br}$) has 35 protons. If it gains one electron, what is its new charge and chemical symbol?

Accepted Answer

$\mathrm{Br^-}$, charge $-1$

Question 16

Which of the following atoms or ions has 53 protons, 74 neutrons, and 54 electrons?

Accepted Answer

$\mathrm{I^-}$

Question 17

A sample contains 7 protons, 8 neutrons, and 10 electrons. What is the atomic symbol and charge of this atom or ion?

Accepted Answer

$\mathrm{N^{3-}}$

Question 18

Which of the following ions is isoelectronic with krypton ($\mathrm{Kr}$)?

Accepted Answer

$\mathrm{Br^-}$

Question 19

A neutral atom of magnesium ($\mathrm{Mg}$) has 12 protons and 12 electrons. If it loses two electrons, what is its resulting charge and chemical symbol?

Accepted Answer

$\mathrm{Mg^{2+}}$

Question 20

Which of the following ions has the same number of electrons as a neutral atom of neon ($\mathrm{Ne}$)?

Accepted Answer

$\mathrm{F^-}$

Atoms, Ions, and the Periodic Table: Study Notes

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