Question 1

Which of the following statements best describes the difference between a period and a group on the periodic table?

Accepted Answer

A period is a horizontal row, while a group is a vertical column.

Question 2

Which of the following elements is most likely to form a cation with a $$+1$$ charge?

Accepted Answer

Sodium ($$Na)$$

Question 3

A neutral atom of magnesium ($$Mg) $$has an atomic number of $$12$$ and a mass number of $$24. $$How many protons, neutrons, and electrons does it have?

Accepted Answer

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

Question 4

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence shell of electrons.

Question 5

Which of the following is the correct electron configuration for a neutral atom of oxygen ($$O$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 6

Which of the following pairs of elements are most likely to form an ionic compound?

Accepted Answer

Sodium ($$Na) $$and Chlorine ($$Cl)$$

Question 7

A patient is exposed to $$\gamma ($$gamma) radiation during a medical imaging procedure. Which property of $$\gamma$$ radiation makes it useful for imaging but also potentially dangerous?

Accepted Answer

$$\gamma$$ radiation has high penetration power and can pass through the body.

Question 8

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons.

Question 9

Which of the following is the correct order of increasing electronegativity?

Accepted Answer

Na \u003c Mg \u003c Cl \u003c F

Question 10

A radioactive isotope has a half-life of $$4$$ hours. If you start with $$80 mg$$, how much will remain after $$12$$ hours?

Accepted Answer

$$10 mg$$

Question 11

Which of the following best describes the trend in atomic radius as you move from left to right across a period in the periodic table?

Accepted Answer

Atomic radius decreases due to increasing nuclear charge.

Question 12

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

Accepted Answer

$$Ca_3$$($$PO_4)_2$

Question 13

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 14

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

Metals have delocalized electrons that can move freely.

Question 15

A sample contains $$2.0$$ moles of glucose ($$C_6H_{12}O_6$). What is the total number of carbon atoms in the sample?

Accepted Answer

$$7.2 	imes 10$$^{24}$$

Question 16

Which of the following best describes the process of beta decay?

Accepted Answer

A neutron is converted into a proton and an electron is emitted.

Question 17

Which of the following is the correct Lewis structure for water ($$H_2O$$)?

Accepted Answer

The oxygen atom is in the center with two single bonds to hydrogen and two lone pairs on oxygen.

Question 18

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

Accepted Answer

Elements in the same group have similar chemical properties.

Question 19

Which of the following best describes the VSEPR theory?

Accepted Answer

Electron pairs around a central atom arrange themselves to minimize repulsion.

Question 20

A radioactive isotope used in cancer therapy emits $$\beta$$ particles. Which of the following is a safety precaution that should be taken when handling this isotope?

Accepted Answer

Wear protective clothing and minimize exposure time.

Study Guide: Atoms, Elements, Molecules, and Nuclear Chemistry

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