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 magnesium (Mg) have?

Accepted Answer

$$2$$

Question 3

Which of the following is the correct Lewis symbol for sodium (Na)?

Accepted Answer

$$\mathrm{Na}\cdot$$

Question 4

What is the correct formula for the ionic compound formed between calcium and chlorine?

Accepted Answer

$$\mathrm{CaCl}_2$$

Question 5

Which of the following best explains why sodium forms a $$+1$$ ion?

Accepted Answer

Sodium loses one electron to achieve the electron configuration of neon.

Question 6

What is the name of the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 7

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

Accepted Answer

$$\mathrm{Na}^+$$

Question 8

What is the correct formula for aluminum sulfate?

Accepted Answer

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

Question 9

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{NH}_4\mathrm{NO}_3$$

Question 10

What is the charge on the phosphate ion?

Accepted Answer

$$-3$$

Question 11

Which of the following is the correct name for $$\mathrm{CuSO}_4$$?

Accepted Answer

Copper(II) sulfate

Question 12

A patient is given a medication containing $$\mathrm{KNO}_3. $$What is the name of this compound?

Accepted Answer

Potassium nitrate

Question 13

Which of the following formulas represents a compound with a 1:1 ratio of cations to anions?

Accepted Answer

$$\mathrm{KBr}$$

Question 14

What is the correct formula for the compound formed between ammonium and phosphate ions?

Accepted Answer

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

Question 15

Which of the following best describes the bonding in $$\mathrm{Na}_2\mathrm{SO}_4$$?

Accepted Answer

Ionic bonds between $$\mathrm{Na}^+$$ and $$\mathrm{SO}_4$$^{2-}$$, covalent bonds within $$\mathrm{SO}_$$4^{2-}$$

Question 16

Which of the following ions has the same number of electrons as a neutral atom of neon?

Accepted Answer

$$\mathrm{F}^-$$

Question 17

What is the correct name for $$\mathrm{Ca}_3(\mathrm{PO}_4)_2$$?

Accepted Answer

Calcium phosphate

Question 18

Which of the following is the correct formula for iron(III) oxide?

Accepted Answer

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

Question 19

A compound contains $$\mathrm{NH}_4^+$$ and $$\mathrm{SO}_4$$^{2-}$$. What is its correct formula?

Accepted Answer

$$\mathrm{(NH}_4)_2\mathrm{SO}_4$$

Question 20

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

Accepted Answer

They contain strong electrostatic attractions between oppositely charged ions.

Ionic and Covalent Compounds: Periodic Trends, Lewis Symbols, and Nomenclature

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