Question 1

Which of the following statements best describes a metalloid?

Accepted Answer

A metalloid is an element that has properties intermediate between metals and nonmetals.

Question 2

Element #16 is found in Group 16 and Period 3 of the periodic table. Which of the following is true about this element?

Accepted Answer

It is a nonmetal and typically forms a 2- anion.

Question 3

Which of the following best explains why the atomic radius increases as you move down a group in the periodic table?

Accepted Answer

The number of energy levels increases, so electrons are farther from the nucleus.

Question 4

A neutral atom of sodium (atomic number 11) has which of the following numbers of protons, neutrons, and electrons? (Assume the most common isotope with mass number 23.)

Accepted Answer

$$11$$ protons, $$12$$ neutrons, $$11$$ electrons

Question 5

Which of the following electron configurations represents a neutral atom of nitrogen (atomic number 7)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 6

Which of the following best describes the process that occurs when a sodium atom forms a sodium ion?

Accepted Answer

The sodium atom loses one electron to form a $$1^+$$ ion.

Question 7

Which of the following compounds is correctly named and written?

Accepted Answer

K$$_2O$$: potassium monoxide

Question 8

Which of the following best explains why Group 1 elements are highly reactive?

Accepted Answer

They have one valence electron that is easily lost to achieve a noble gas configuration.

Question 9

Which of the following is the correct formula for the compound formed between magnesium and chlorine?

Accepted Answer

MgCl$$_2$$

Question 10

A sample of oxygen contains two isotopes: $$^{16}O (99.76$$%) and $$^{18}O (0.20$$%). What is the number of protons and neutrons in an atom of $$^{18}O$$?

Accepted Answer

$$8$$ protons and $$10$$ neutrons

Question 11

Which of the following best describes the difference between ionic and molecular compounds?

Accepted Answer

Ionic compounds are formed by transferring electrons from metals to nonmetals, while molecular compounds are formed by sharing electrons between nonmetals.

Question 12

Which of the following statements about the periodic table is correct?

Accepted Answer

There are 7 periods and 18 groups.

Question 13

Which of the following best describes the trend in ionization energy across a period from left to right?

Accepted Answer

Ionization energy increases because atoms get smaller and electrons are held more tightly.

Question 14

Which of the following is the correct condensed electron configuration for chlorine (atomic number 17)?

Accepted Answer

$$[Ne]\ 3s^2$\ 3p^5$

Question 15

Which of the following ions is isoelectronic with neon ($$Ne$$)?

Accepted Answer

$$Mg^{2+}$$

Question 16

Which of the following best describes the energy change when an electron moves from a higher energy level ($$n=3) to a $$lower energy level ($$n=2) in a $$hydrogen atom?

Accepted Answer

The electron emits a photon and the atom emits light.

Question 17

Which of the following is the correct name for the compound $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

Question 18

Which of the following best explains why noble gases do not form ions?

Accepted Answer

They have a full outer shell of electrons and are already stable.

Question 19

Which of the following is the correct Lewis structure for a neutral atom of carbon?

Accepted Answer

A symbol 'C' with four dots around it, one on each side.

Question 20

A patient is given a medication containing calcium ions. Which group on the periodic table does calcium belong to, and what is the typical charge of its ion?

Accepted Answer

Group 2; $$2^+$$

Study Guide: Atoms, Elements, and Ionic/Molecular Compounds (Chapters 4 & 6, Sections 1-3)

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