Question 1

Which statement best describes the difference between isotopes of the same element?

Accepted Answer

They have the same number of protons but different numbers of neutrons.

Question 2

A naturally occurring sample of copper contains 69.17% Cu-63 (mass = 62.93 amu) and 30.83% Cu-65 (mass = 64.93 amu). What is the atomic weight of copper? Use the formula $$	ext{Atomic Weight} = \sum [(	ext{isotope abundance}) 	imes (	ext{isotope mass})].$$

Accepted Answer

$$63.55\ 	ext{amu}$$

Question 3

Which of the following elements is classified as a metalloid?

Accepted Answer

Silicon (Si)

Question 4

An atom has 13 electrons and 14 neutrons. What is its atomic symbol in the format $$^{A}_{Z}X$$?

Accepted Answer

$$^{27}_{13}Al$$

Question 5

Which pair of symbols represents isotopes of the same element?

Accepted Answer

$$^{19}_{9}X$$\ and\ ^{21}_{9}X$

Question 6

Which of the following is NOT a property of metals?

Accepted Answer

Brittle and dull

Question 7

What is the mass number ($$A) of an $$atom with 27 protons and 33 neutrons?

Accepted Answer

$$A = 60$$

Question 8

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 8A (Group 18)

Question 9

According to Dalton’s atomic theory, which statement is correct?

Accepted Answer

Atoms of a given element differ from atoms of other elements.

Question 10

Which element is found in Group 2A and is used in medical imaging and cancer treatments?

Accepted Answer

Strontium (Sr)

Question 11

How many electrons are in a neutral atom of zinc with atomic number $$Z = 30$$ and mass number $$A = 65$$?

Accepted Answer

30 electrons

Question 12

Which of the following best describes a p orbital?

Accepted Answer

Dumbbell-shaped

Question 13

What is the maximum number of valence electrons that can be shown around an atomic symbol in an electron-dot diagram?

Accepted Answer

8

Question 14

Which of the following elements is a halogen?

Accepted Answer

Fluorine (F)

Question 15

Which property is shared by all elements in the same group of the periodic table?

Accepted Answer

They have similar chemical properties.

Question 16

Which of the following statements about nonmetals is true?

Accepted Answer

They are generally brittle and dull.

Question 17

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

Accepted Answer

Atomic number = 17, Mass number = 35

Question 18

Which of the following is the correct electron-dot symbol for a neon atom?

Accepted Answer

Ne with 8 dots around it

Question 19

Which of the following statements about orbitals is correct?

Accepted Answer

An orbital is a three-dimensional space where an electron is most likely to be found.

Question 20

For the representative elements, how is the number of valence electrons determined?

Accepted Answer

It equals the group number (using the 1A-8A system).

Atoms and the Periodic Table: Structure, Classification, and Properties

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