Question 1

Which element has a variable charge?

Accepted Answer

Fe (iron) can have multiple oxidation states, such as +2 and +3, which means it can have a variable charge.

Question 2

Consider the A atom and the A2- ion. Which will have the larger radius (size)?

Accepted Answer

When an atom gains electrons to form an anion (A2- in this case), its radius increases due to increased electron-electron repulsion in the electron cloud.

Question 3

________ are negatively charged ions that have ________ electrons than protons.

Accepted Answer

Anions are negatively charged ions, which means they have gained electrons, resulting in more electrons than protons.

Question 4

What is the ion symbol for an atom with sixteen (16)protons and eighteen (18)electrons?

Accepted Answer

The element with 16 protons is sulfur (S). With 18 electrons, it has gained 2 extra electrons, giving it a 2- charge, represented as S^2-.

Question 5

What is the ion symbol of the oxide ion?

Accepted Answer

The oxide ion is formed when an oxygen atom gains two electrons, resulting in a charge of 2-. Hence, the symbol is O^2-.

Question 6

Consider the B atom and the B+ ion. Which will have the larger radius (size)?

Accepted Answer

The B atom will have a larger radius compared to the B+ ion. When an atom loses an electron to become a positive ion (cation), its radius decreases because the loss of an electron reduces electron-electron repulsion and allows the nucleus to pull the remaining electrons closer.

Question 7

Which statement best explains the basis for the octet rule?

Accepted Answer

The octet rule is based on the observation that atoms are most stable when they have eight electrons in their valence shell, which gives them the same electron configuration as a noble gas. This stability is achieved through the loss, gain, or sharing of electrons in chemical bonds.

Question 8

When forming ions,metals typically do which of the following?

Accepted Answer

Metals tend to lose electrons during chemical reactions to form cations, which are positively charged ions. This is because metals have relatively low ionization energies, making it easier for them to lose electrons than to gain them.

Question 9

What is the formula for the ionic compound lithium oxide?

Accepted Answer

Lithium oxide is formed by combining lithium ions (Li⁺) and oxide ions (O²⁻). Two lithium ions are needed to balance the charge of one oxide ion, resulting in the formula Li₂O.

Question 10

Which pair of elements will form an ionic compound?

Accepted Answer

Ionic compounds are formed between metals and non-metals. Iron (Fe) is a metal, while chlorine (Cl) is a non-metal, making them likely to form an ionic compound.

Question 11

What is the symbol for the ion formed by magnesium?

Accepted Answer

Magnesium typically forms a +2 ion, denoted as Mg^2+, which is represented by the symbol in choice C.

Question 12

What is the ion symbol for an atom with twenty (20)protons and eighteen (18)electrons?

Accepted Answer

The atom with 20 protons is calcium (Ca). With 18 electrons, it has lost 2 electrons, resulting in a 2+ charge, making the ion symbol Ca²⁺.

Question 13

How many protons and electrons are present in Co²⁺?

Accepted Answer

Cobalt (Co) has an atomic number of 27, meaning it has 27 protons. The Co²⁺ ion has lost 2 electrons, so it has 25 electrons.

Question 14

Which statement concerning the ion Li⁺ is correct?

Accepted Answer

Li+ is formed when a lithium atom loses one electron, leaving it with two electrons.

Question 15

What is the formula for the ionic compound formed when potassium and bromine combine?

Accepted Answer

Potassium (K) and bromine (Br) combine to form KBr, where potassium donates one electron to bromine, resulting in a stable ionic compound with the formula KBr.

Question 16

Which is NOT a covalent compound?

Accepted Answer

NaNO₂ is an ionic compound because it contains the metal sodium (Na) bonded to the polyatomic ion nitrite (NO₂^-), which involves ionic bonding.

Question 17

What is the electron configuration of an F^- ion?

Accepted Answer

The notation provided seems to be a mix-up or a misunderstanding. However, interpreting it as a request for the electron configuration of a hypothetical ion with a specific notation, the closest logical answer based on standard electron configuration principles would be option C. This is because it follows the correct filling order of electron orbitals (1s, 2s, 2p) and fills the 2p orbital with 6 electrons, which is its maximum capacity, indicating a stable configuration. The other options either do not fill the orbitals in the correct order or do not fill them to their correct capacities.

Question 18

Which is NOT an ionic compound?

Accepted Answer

CBr4 (Carbon tetrabromide) is not an ionic compound; it is a covalent compound because it is formed by nonmetals carbon and bromine sharing electrons, unlike the others which are formed by metal and nonmetal ions.

Question 19

In bonding,main group elements ________ to attain the electronic configuration of the noble gas closest to them in the periodic table.

Accepted Answer

Main group elements can gain, lose, or share electrons in order to achieve a stable electronic configuration similar to the nearest noble gas. This process is fundamental to the formation of ionic and covalent bonds.

Question 20

What is the charge of the ions formed by group 7A elements?

Accepted Answer

Group 7A elements (halogens) typically gain one electron to achieve a stable electron configuration, resulting in a -1 charge.

Quiz 3: Ionic Compounds

Which element has a variable charge?

Consider the A atom and the A2- ion. Which will have the larger radius (size) ?

are negatively charged ions that have electrons than protons.

What is the ion symbol for an atom with sixteen (16) protons and eighteen (18) electrons?

What is the ion symbol of the oxide ion?

Consider the B atom and the B+ ion. Which will have the larger radius (size) ?

Which statement best explains the basis for the octet rule?

When forming ions,metals typically do which of the following?

What is the formula for the ionic compound lithium oxide?

Which pair of elements will form an ionic compound?

What is the symbol for the ion formed by magnesium?

What is the ion symbol for an atom with twenty (20) protons and eighteen (18) electrons?

How many protons and electrons are present in Co²⁺?

Which statement concerning the ion Li⁺ is correct?

What is the formula for the ionic compound formed when potassium and bromine combine?

Which is NOT a covalent compound?

What is the electron configuration of an F^- ion?

Which is NOT an ionic compound?

In bonding,main group elements ________ to attain the electronic configuration of the noble gas closest to them in the periodic table.

What is the charge of the ions formed by group 7A elements?

Quiz 3: Ionic Compounds

Which element has a variable charge?

Consider the A atom and the A2- ion. Which will have the larger radius (size) ?

________ are negatively charged ions that have ________ electrons than protons.

What is the ion symbol for an atom with sixteen (16) protons and eighteen (18) electrons?

What is the ion symbol of the oxide ion?

Consider the B atom and the B+ ion. Which will have the larger radius (size) ?

Which statement best explains the basis for the octet rule?

When forming ions,metals typically do which of the following?

What is the formula for the ionic compound lithium oxide?

Which pair of elements will form an ionic compound?

What is the symbol for the ion formed by magnesium?

What is the ion symbol for an atom with twenty (20) protons and eighteen (18) electrons?

How many protons and electrons are present in Co2+?

Which statement concerning the ion Li+ is correct?

What is the formula for the ionic compound formed when potassium and bromine combine?

Which is NOT a covalent compound?

What is the electron configuration of an F- ion?

Which is NOT an ionic compound?

In bonding,main group elements ________ to attain the electronic configuration of the noble gas closest to them in the periodic table.

What is the charge of the ions formed by group 7A elements?

are negatively charged ions that have electrons than protons.

How many protons and electrons are present in Co²⁺?

Which statement concerning the ion Li⁺ is correct?

What is the electron configuration of an F^- ion?