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

Question 1

Which of the following statements best describes how a cation is formed?

Accepted Answer

A metal loses electrons to become positively charged.

Question 2

What is the correct symbol for the ion with 30 neutrons, 25 protons, and a $+4$ charge?

Accepted Answer

$\mathrm{Mn}^{4+}$

Question 3

An atom of $^{27}_{13}\mathrm{Al}^{3+}$ has how many protons, neutrons, and electrons?

Accepted Answer

13 protons, 14 neutrons, 10 electrons

Question 4

Which pair of species are both isoelectronic and isotopic?

Accepted Answer

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

Question 5

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

Accepted Answer

$^{65}_{37}\mathrm{Rb}^{9+}$

Question 6

How many electrons does $^{81}_{35}\mathrm{Br}^{-}$ have?

Accepted Answer

36

Question 7

Which of the following ions is isoelectronic with $\mathrm{Ne}$?

Accepted Answer

$\mathrm{F}^{-}$

Question 8

If an atom has 76 protons, 116 neutrons, and 192 electrons, what is its net charge?

Accepted Answer

$2-$

Question 9

Which of the following best describes an anion?

Accepted Answer

An atom that gains electrons and becomes negatively charged.

Question 10

What is the mass number of $^{200}_{80}\mathrm{Hg}^{2+}$?

Accepted Answer

200

Question 11

Which of the following ions has the same number of electrons as $\mathrm{Co}^{2+}$?

Accepted Answer

$\mathrm{Fe}^{3+}$

Question 12

A neutral atom of $^{35}_{17}\mathrm{Cl}$ has how many protons, neutrons, and electrons?

Accepted Answer

17 protons, 18 neutrons, 17 electrons

Question 13

Which of the following ions is both isoelectronic and isotopic with $^{40}_{20}\mathrm{Ca}^{2+}$?

Accepted Answer

$^{40}_{18}\mathrm{Ar}$

Question 14

Which of the following ions has 46 neutrons, 36 protons, and 82 electrons?

Accepted Answer

$\mathrm{Se}^{2-}$

Question 15

What is the charge on an ion with 80 protons and 78 electrons?

Accepted Answer

$2+$

Question 16

Which of the following ions has the same number of electrons as $\mathrm{Br}^{-}$?

Accepted Answer

$\mathrm{Kr}$

Question 17

If an atom has 120 neutrons, 80 protons, and 200 electrons, what is its net charge?

Question 18

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

Accepted Answer

$\mathrm{Cl}^{-}$

Question 19

A neutral atom of $^{81}_{35}\mathrm{Br}$ has how many neutrons?

Accepted Answer

46

Question 20

Which of the following ions has 120 neutrons, 80 protons, and a $2+$ charge?

Accepted Answer

$^{200}_{80}\mathrm{Hg}^{2+}$

Ion Formation and Isotopes in GOB Chemistry

Study Guide - Practice Questions