$$^{40}_{20}\mathrm{Ca}^{2+}$$ \,\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?

Accepted Answer

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

스터디 가이드 - 연습 문제