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

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

Question 1

Which of the following best describes how a metal forms a cation?

Accepted Answer

By losing electrons to achieve a noble gas configuration

Question 2

A neutral magnesium atom (Z = 12) forms an ion to achieve a filled outer shell. How many electrons must it lose, and what is the resulting electron configuration?

Accepted Answer

It must lose 2 electrons; $$1s^2$$ $$2s^2$$ $$2p^6$$

Question 3

Which of the following pairs are both isoelectronic and isotopic?

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

Which of the following elements would lose an electron the easiest?

Accepted Answer

Li

Question 6

Which of the following ions is unlikely to occur based on periodic trends?

Accepted Answer

$$Al^{3-}$$

Question 7

Which of the following atoms has the smallest ionization energy?

Accepted Answer

K

Question 8

Which of the following has the highest ionization energy?

Accepted Answer

$$Na^+$$

Question 9

Which of the following elements possesses a $$-2$$ charge when it combines with other elements?

Accepted Answer

Se

Question 10

What is the systematic name for the ion $$Fe^{3+}$$?

Accepted Answer

Iron (III) ion

Question 11

Which of the following represents the oxide ion?

Accepted Answer

$$O^{2-}$$

Question 12

What is the formula unit for the compound formed by $$Mg^{2+}$$ and $$SO_4$$^{2-}$$?

Accepted Answer

$$MgSO_4$$

Question 13

Which of the following compounds has properties most similar to sodium chloride, $$NaCl$$?

Accepted Answer

Potassium bromide, $$KBr$$

Question 14

Which of the following polyatomic ions is the only major polyatomic cation with a $$+1$$ charge?

Accepted Answer

$$NH_4$$^+$$

Question 15

What is the systematic name for $$NO_2$$^-$$?

Accepted Answer

Nitrite

Question 16

Which of the following best describes the structure shown in the image of a cube with alternating green and orange spheres?

Accepted Answer

An ionic crystal lattice

Question 17

Which of the following is the correct formula for hydrofluoric acid?

Accepted Answer

$$HF$$

Question 18

Which of the following best explains why ionic compounds have high melting and boiling points?

Accepted Answer

They have strong electrostatic attractions between oppositely charged ions

Question 19

Which of the following is the correct name for $$Al($$BrO_4$$)_3$$?

Accepted Answer

Aluminum perbromate

Question 20

Which of the following is the correct formula for sodium dichromate?

Accepted Answer

$$Na_2Cr_2O_7$$

Ionic Compounds: Structure, Formation, and Nomenclature

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