Question 1

Which of the following statements best describes the trend in metallic character across a period in the periodic table?

Accepted Answer

Metallic character decreases from left to right across a period.

Question 2

How many valence electrons does an atom of sulfur (S) have?

Accepted Answer

$$6$$

Question 3

Which of the following is the correct Lewis symbol for magnesium (Mg)?

Accepted Answer

$$\mathrm{Mg}$$ with two dots on the right side

Question 4

A neutral atom of chlorine has 17 protons and 17 electrons. What is the charge and electron count of a chloride ion ($$\mathrm{Cl}^-$$)?

Accepted Answer

Charge: $$-1$$, Electrons: $$18$$

Question 5

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from a metal to a nonmetal.

Question 6

What is the correct formula for the ionic compound formed between barium ($$\mathrm{Ba}^{2+}) $$and chloride ($$\mathrm{Cl}^-) $$ions?

Accepted Answer

$$\mathrm{BaCl}_2$$

Question 7

Which of the following is the correct name for the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 8

A patient is given a medication containing $$\mathrm{Mg}^{2+}$$ and $$\mathrm{NO}_3^-$$ ions. What is the correct formula for this compound?

Accepted Answer

$$\mathrm{Mg(NO}_3)_2$$

Question 9

Which of the following statements about polyatomic ions is correct?

Accepted Answer

Polyatomic ions are groups of covalently bonded atoms with an overall charge.

Question 10

What is the correct formula for aluminum sulfate, given that the sulfate ion is $$\mathrm{SO}_4$$^{2-}$$ and the aluminum ion is $$\mathrm{Al}^{3+}$$?

Accepted Answer

$$\mathrm{Al}_2(\mathrm{SO}_4)_3$$

Question 11

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

Accepted Answer

They have strong electrostatic attractions between oppositely charged ions.

Question 12

What is the correct name for the compound $$\mathrm{CuSO}_4$$?

Accepted Answer

Copper(II) sulfate

Question 13

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

Accepted Answer

$$\mathrm{Na}^+$$

Question 14

A sample contains an ion with 16 protons and 18 electrons. What is the symbol for this ion?

Accepted Answer

$$\mathrm{S}^{2-}$$

Question 15

Which of the following formulas represents the correct ratio of ions in calcium phosphate?

Accepted Answer

$$\mathrm{Ca}_3(\mathrm{PO}_4)_2$$

Question 16

Which of the following is the correct name for $$\mathrm{K}_2\mathrm{SO}_4$$?

Accepted Answer

Potassium sulfate

Question 17

What is the correct formula for iron(III) oxide?

Accepted Answer

$$\mathrm{Fe}_2\mathrm{O}_3$$

Question 18

Which of the following best describes the process of forming a cation?

Accepted Answer

A neutral atom loses electrons.

Question 19

Which of the following is the correct formula for ammonium phosphate?

Accepted Answer

$$\mathrm{(NH}_4)_3\mathrm{PO}_4$$

Question 20

Which of the following is a property of ionic compounds?

Accepted Answer

They are hard and brittle with high melting points.

Week 3: Ionic and Covalent Bonding, Periodic Trends, and Polyatomic Ions

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