Question 1

An atom of bromine (Br) has an atomic number of 35 and a mass number of 80. How many neutrons are present in this atom?

Accepted Answer

45

Question 2

Which of the following statements best describes the periodic law?

Accepted Answer

The physical and chemical properties of the elements are periodic functions of their atomic numbers.

Question 3

Selenium (Se) has an atomic number of 34. What is its group and period on the periodic table?

Accepted Answer

Group 6A, Period 4

Question 4

Which element is most likely to have chemical properties similar to krypton (Kr)?

Accepted Answer

Neon (Ne)

Question 5

Which of the following lists contains only alkali metals?

Accepted Answer

Li, Na, K

Question 6

Which of the following is a property of metals?

Accepted Answer

High thermal and electrical conductivity

Question 7

How many valence electrons does an atom of aluminum (Al) have?

Accepted Answer

3

Question 8

According to the octet rule, how do elements on the right side of the periodic table typically achieve a stable electron configuration?

Accepted Answer

By gaining electrons to reach the next noble gas configuration

Question 9

Which of the following ions is formed when a magnesium atom reacts to achieve a noble gas configuration?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$}$$

Question 10

Which of the following elements will form an ion with a charge of $$+3$$?

Accepted Answer

Aluminum (Al)

Question 11

A nonmetal atom tends to form which type of ion?

Accepted Answer

Anion

Question 12

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 13

Which of the following best describes the electron configuration of a fluoride ion ($$\mathrm{F^-}$$)?

Accepted Answer

Same as neon ($$\mathrm{Ne})$$

Question 14

Which group on the periodic table contains the least reactive elements?

Accepted Answer

Group 8A (Noble Gases)

Question 15

Which of the following elements is a nonmetal?

Accepted Answer

Oxygen (O)

Question 16

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its atomic mass?

Accepted Answer

35

Question 17

Which of the following elements is in Group 2A and Period 4?

Accepted Answer

Calcium (Ca)

Question 18

Which of the following best describes the trend in chemical reactivity for alkali metals as you move down Group 1A?

Accepted Answer

Reactivity increases

Question 19

Which of the following is a property of metalloids?

Accepted Answer

Conduct electricity moderately well

Question 20

A patient is found to have a deficiency in potassium ions ($$\mathrm{K^+}). $$Which group and period does potassium belong to?

Accepted Answer

Group 1A, Period 4

Atoms, Elements, and the Periodic Table: Study Guide for General Chemistry

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