$$\mathrm{^{24}Mg}$$ \text{ and } \mathrm{^{24}$$Mg^{2+}$$}$

Question 1

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

Accepted Answer

By losing electrons to achieve a noble gas configuration.

Question 2

A neutral atom of magnesium has 12 protons and 12 neutrons. What is the symbol for the ion formed when this atom loses two electrons?

Accepted Answer

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

Question 3

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

Accepted Answer

$$\mathrm{Na$$^{+}$$}$$

Question 4

A certain ion has 28 electrons, 35 neutrons, and a mass number of 65. What is the symbol for this ion?

Accepted Answer

$$\mathrm{^{65}Cu$$^{2+}$$}$$

Question 5

Which of the following pairs are both isoelectronic and isotopic?

Accepted Answer

$$\mathrm{^{24}Mg}$$ 	ext{ and } \mathrm{^{24}$$Mg^{2+}$$}$

Question 6

Which of the following ions has 30 neutrons, 21 electrons, and a $$+4$$ charge?

Accepted Answer

$$\mathrm{^{52}Ti$$^{4+}$$}$$

Question 7

If an atom of boron ($$\mathrm{^{11}B}) $$gains three electrons, what is the resulting ion's charge?

Accepted Answer

$$3-$$

Question 8

Which of the following statements about isoelectronic species is correct?

Accepted Answer

Isoelectronic species have the same number of electrons but different numbers of protons.

Question 9

A $$\mathrm{Fe$$^{2+}$$}$$ ion has 26 protons and 24 electrons. What is the net charge of this ion?

Accepted Answer

$$+2$$

Question 10

Which of the following ions is formed when a neutral sodium atom loses one electron?

Accepted Answer

$$\mathrm{Na$$^{+}$$}$$

Question 11

A neutral atom has 20 protons, 20 neutrons, and 18 electrons. What is the symbol for this ion?

Accepted Answer

$$\mathrm{^{40}Ca$$^{2+}$$}$$

Question 12

Which of the following best explains why $$\mathrm{Mg$$^{2+}$$}$$ and $$\mathrm{Na$$^{+}$$}$$ are isoelectronic?

Accepted Answer

Both ions have the same number of electrons, 10.

Question 13

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

Accepted Answer

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

Question 14

A $$\mathrm{Cu$$^{2+}$$}$$ ion has 27 electrons. What is the atomic number of copper?

Accepted Answer

29

Question 15

Which of the following ions is NOT isoelectronic with $$\mathrm{Ne}$$?

Accepted Answer

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

Ion Formation and Isotopes: Study Notes for Introduction to Chemistry

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