Question 1

Which of the following is the correct electron configuration for the Co$$^{3+}$$ ion?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^6$

Question 2

When forming a cation from a transition metal atom, from which orbital are electrons removed first?

Accepted Answer

From the orbital with the highest principal quantum number $$n$$

Question 3

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

Accepted Answer

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

Question 4

What is the electron configuration of $$\mathrm{Tc}^{3+}$$, given that the ground state of $$\mathrm{Tc} is$$ $$[\mathrm{Kr}]\ 5s^2$ 4d^5$?

Accepted Answer

$$[\mathrm{Kr}]\ 4d^4$

Question 5

Which of the following oxides will form an acidic solution when dissolved in water?

Accepted Answer

$$\mathrm{SO}_2$$

Question 6

How many of the following oxides are expected to form acidic solutions in water: $$\mathrm{SO}_2$$, $$\mathrm{Y}_2\mathrm{O}_3$$, $$\mathrm{MgO}$$, $$\mathrm{Cl}_2\mathrm{O}$$, $$\mathrm{N}_2\mathrm{O}_5$$?

Accepted Answer

4

Question 7

Which balanced chemical equation represents the reaction of selenium dioxide with water?

Accepted Answer

$$\mathrm{SeO}_2(s) + \mathrm{H}_2\mathrm{O}(l) \rightarrow \mathrm{H}_2\mathrm{SeO}_3(aq)$$

Question 8

Which of the following best describes the reaction of a nonmetal oxide with a base such as NaOH?

Accepted Answer

It forms a salt and water.

Question 9

What is the balanced chemical equation for the reaction of cesium metal with water?

Accepted Answer

$$2\ \mathrm{Cs}(s) + 2\ \mathrm{H}_2\mathrm{O}(l) \rightarrow 2\ \mathrm{CsOH}(aq) + \mathrm{H}_2(g)$$

Question 10

Which of the following statements about the reactivity of alkali metals with oxygen is correct?

Accepted Answer

Some alkali metals produce peroxides or superoxides when reacting with oxygen.

Question 11

Which of the following is the correct electron configuration for $$\mathrm{S}^{2-}$$?

Accepted Answer

$$[\mathrm{Ne}]\ 3s^2$ 3p^6$

Question 12

Which of the following best explains why $$\mathrm{Ca}^{2+}$$ and $$\mathrm{S}^{2-}$$ are isoelectronic?

Accepted Answer

Both have the same number of electrons as $$\mathrm{Ar}.$$

Question 13

Which of the following is a correct balanced equation for the reaction of cesium metal with chlorine gas?

Accepted Answer

$$2\ \mathrm{Cs}(s) + \mathrm{Cl}_2(g) \rightarrow 2\ \mathrm{CsCl}(s)$$

Question 14

Which of the following best describes the trend in reactivity of alkali metals down the group?

Accepted Answer

Reactivity increases as you move down the group.

Question 15

Which of the following is the correct electron configuration for $$\mathrm{Ga}^{3+}$$?

Accepted Answer

$$[\mathrm{Ar}]\ 3d$$^{10}$$

Question 16

Which of the following is the correct electron configuration for $$\mathrm{Cr}^{3+}$$?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^3$

Question 17

Which of the following best describes the reaction of a nonmetal oxide with water?

Accepted Answer

It forms an acid.

Question 18

Which of the following is a correct balanced equation for the reaction of cesium metal with hydrogen gas?

Accepted Answer

$$2\ \mathrm{Cs}(s) + \mathrm{H}_2(g) \rightarrow 2\ \mathrm{CsH}(s)$$

General Chemistry Practice: Electron Configurations and Chemical Reactions

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