Q: Given the isotopic data for antimony (Sb): $$\begin{array}{|c|c|c|} \hline \text{Isotope} & \text{Isotopic Mass (amu)} & \text{Abundance} \\ \$$hline ^{121}$$\mathrm{Sb} & 120.9038 & \\ \hline \text{---Sb} & & 42.79 \\ \hline \end{array}$$ Which of the following correctly fills in the missing isotope and its mass?

$$^{121}\mathrm{Sb}$$, \text{abundance} = 57.21\%;\ ^{123}\mathrm{Sb}, \text{mass} = 122.9049\ \mathrm{amu}$

Question 1

Which of the following species is isoelectronic with $$\mathrm{Se$$^{2-}$$}$$?

Accepted Answer

$$\mathrm{Kr}$$

Question 2

Given the isotopic data for antimony (Sb):

$$\begin{array}{|c|c|c|}
\hline
	ext{Isotope} & 	ext{Isotopic Mass (amu)} & 	ext{Abundance} \
\$$hline
^{121}$$\mathrm{Sb} & 120.9038 & \
\hline
	ext{---Sb} & & 42.79 \
\hline
\end{array}$$

Which of the following correctly fills in the missing isotope and its mass?

Accepted Answer

$$^{121}\mathrm{Sb}$$, 	ext{abundance} = 57.21\%;\ ^{123}\mathrm{Sb}, 	ext{mass} = 122.9049\ \mathrm{amu}$

Question 3

Which property is most similar for elements in the same group of the periodic table?

Accepted Answer

Chemical properties

Question 4

Given the electron arrangements $$2,\ 8,\ 8,\ 1$$ and $$2,\ 8,\ 6$$, identify the symbol for the cation, the symbol for the anion, the formula for the ionic compound they form, and the name of the ionic compound.

Accepted Answer

Symbol of the cation: $$\mathrm{K$$^{+}$$}$$; symbol of the anion: $$\mathrm{S$$^{2-}$$}$$; formula: $$\mathrm{K_2S}$$; name: potassium sulfide

Question 5

A personal flotation device worn by a child in a pool contains particles that are far apart. What state of matter is present inside the device?

Accepted Answer

Gas

Question 6

Which set contains a metal, a nonmetal, and a metalloid in this order?

Accepted Answer

$$\mathrm{Ga,\ H,\ Si}$$

Question 7

Three isotopes of magnesium, with mass numbers 24, 25, and 26, exist naturally. How are these isotopes similar?

Accepted Answer

The isotopes have the same number of protons.

Question 8

Calculate the molar mass of the following compounds:
(i) $$\mathrm{Co(ClO)_2}
(ii$$) $$\mathrm{N_2S_5}
($$iii) $$\mathrm{Cu($$ClO_3$$)_2}$$

Accepted Answer

i) $$161.83\ \mathrm{g/mol}$$, ii) $$188.37\ \mathrm{g/mol}$$, iii) $$263.78\ \mathrm{g/mol}$$

Question 9

A yellow solid is exposed to sunlight, resulting in a white metal and an orange gas. Neither the metal nor the gas can be further decomposed by chemical processes. Identify the elements and compounds among the yellow solid, white metal, and orange gas.

Accepted Answer

Element: white metal and orange gas; Compound: yellow solid

Question 10

Which of the following does NOT have a charge of $$-1$$?

Accepted Answer

Ammonium only

Question 11

Which statement is true about the number of protons in an atom of $$\mathrm{Cl}$$ and an atom of $$\mathrm{Mg}$$?

Accepted Answer

An atom of Cl has a greater number of protons than an atom of Mg.

Question 12

Identify the formula of the compounds with the names given below:
carbon tetrachloride, diboron trisulfide, xenon tetrafluoride, iodine monochloride, phosphorus pentasulfide.

Accepted Answer

$$\mathrm{$$CCl_4$$}$$, $$\mathrm{B_2S_3}$$, $$\mathrm{$$XeF_4$$}$$, $$\mathrm{ICl}$$, $$\mathrm{PS_5$}$$

Question 13

Identify the names of the positive ions involved in each of the following compounds:
A) $$\mathrm{MgO}
B$$) $$\mathrm{K_2SO_4}
C$$) $$\mathrm{$$NaBrO_4$$}
D$$) $$\mathrm{Co(NO_3$)_2}
E$$) $$\mathrm{Mn(OH)_2}$$

Accepted Answer

A) Magnesium ion; B) Potassium ion; C) Sodium ion; D) Cobalt (II) ion; E) Manganese (II) ion

Question 14

Identify the name of the element with atomic number 12 and the category it belongs to.

Accepted Answer

Magnesium, Alkaline Earth

Question 15

Which of the following best describes why $$\mathrm{K_2S}$$ forms from potassium and sulfur?

Accepted Answer

Potassium loses one electron and sulfur gains two electrons.

Question 16

Which of the following is a metalloid?

Accepted Answer

Silicon

Question 17

Which of the following ions is polyatomic?

Accepted Answer

Ammonium

Question 18

A sample contains $$2.5$$ moles of $$\mathrm{N_2S_5}. $$What is its mass in grams? (Molar mass of $$\mathrm{N_2S_5} = 188.37\ \mathrm{g/mol})$$

Accepted Answer

$$470.93\ \mathrm{g}$$

Antimony Isotopes: Completing Isotopic Data Tables

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