Question 1

Which of the following best describes the properties of a metalloid?

Accepted Answer

Brittle solid, conducts electricity moderately well, can be shiny or dull.

Question 2

Which group on the periodic table contains the halogens?

Accepted Answer

7A

Question 3

An atom of aluminum (Al) loses three electrons to form an ion. What is the electron configuration of the resulting ion?

Accepted Answer

$$[Ne]$$

Question 4

Which of the following elements will form an ion with a charge of $$-1$$?

Accepted Answer

I

Question 5

How many electrons are present in a $$\mathrm{P$$^{3-}$$}$$ ion?

Accepted Answer

18

Question 6

A potassium ion ($$\mathrm{K^+}) $$has how many protons, neutrons, and electrons? (Potassium atomic number = 19, mass number = 39)

Accepted Answer

19 protons, 20 neutrons, 18 electrons

Question 7

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

Accepted Answer

$$\mathrm{Na^+}$$

Question 8

Which of the following statements about transition metals is correct?

Accepted Answer

Transition metals can form ions with variable positive charges.

Question 9

A sample contains $$\mathrm{Mg$$^{2+}$$}$$ ions. How many electrons does each ion have?

Accepted Answer

10

Question 10

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 11

Which of the following ions is isoelectronic with $$\mathrm{F^-}$$?

Accepted Answer

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

Question 12

A brittle solid at room temperature that conducts electricity moderately well and is used in computer chips is most likely a:

Accepted Answer

Metalloid

Question 13

Which of the following ions has 18 electrons?

Accepted Answer

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

Question 14

Which of the following elements is a nonmetal and is a gas at room temperature?

Accepted Answer

Oxygen

Question 15

Which of the following ions is formed when an atom gains two electrons?

Accepted Answer

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

Question 16

A patient is found to have a high concentration of $$\mathrm{K^+} in $$their blood. Which of the following statements is true about $$\mathrm{K^+}$$?

Accepted Answer

$$\mathrm{K^+}$$ has 18 electrons.

Question 17

Which of the following best describes the octet rule?

Accepted Answer

Atoms react to achieve the electron configuration of the nearest noble gas.

Question 18

Which of the following ions is most likely to be found in table salt?

Accepted Answer

$$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$

Question 19

Which of the following ions has the same number of electrons as $$\mathrm{Ar}$$?

Accepted Answer

$$\mathrm{Cl^-}$$

Question 20

A sample contains $$\mathrm{Fe$$^{3+}$$}$$ ions. How many electrons does each ion have? (Iron atomic number = 26)

Accepted Answer

23

Atoms, Elements, and Ion Formation: Properties and Classification

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