Module 4 - Atoms V5

Question 1

The law of constant composition states that all samples of a pure compound will always have the same elements in the same proportion.

Answer 1

true

Question 2

An element consists of more than one type of atom.

Answer 2

false

Question 3

Who discovered the atom?

Answer 3

Leucippus and Democritus

Question 4

Which scientist is credited with discovering the electron?

Answer 4

Thomson

Question 5

Electrons are positively charged.

Answer 5

false

Question 6

Electrons are smaller than protons.

Answer 6

true

Question 7

The mass number is always equal to the charge.

Answer 7

false

Question 8

The atomic number of an atom is equal to…

Answer 8

the number of protons

Question 9

The mass number is the number of electrons and protons in an atom.

Answer 9

false

Question 10

Isotopes are not naturally present in nature.

Answer 10

false

Question 11

The average atomic mass of an element does not account for naturally occurring isotopes.

Answer 11

false

Question 12

What subatomic particle is not considered when calculating atomic mass?

Answer 12

electrons

Question 13

The horizontal rows of the periodic table are called…

Answer 13

periods

Question 14

The periodic table has 7 periods.

Answer 14

true

Question 15

A nonmetal is a shiny, malleable element that is a good conductor of heat and electricity.

Answer 15

false

Question 16

Who is often considered to be the father of atomic theory?

Answer 16

Dalton

Question 17

Which is not a postulate of Dalton’s atomic theory?

Answer 17

An element consists of multiple types of atoms.

Question 18

Thomson conducted the oil drop experiment, resulting in the calculation of electrical charge.

Answer 18

false

Question 19

Based on the results of the gold foil experiment, Rutherford is known for his discovery of the…

Answer 19

proton

Question 20

Millikan conducted the oil drop experiment, which resulted in the discovery of how the _____ of a(n) _____ is calculated.

Answer 20

mass; electron

Question 21

_________ came up with the plum pudding model of the atom following his discovery of the electron.

Answer 21

Thomson

Question 22

Which is not a subatomic particle?

Answer 22

isotope

Question 23

The ______ is the center of an atom.

Answer 23

nucleus

Question 24

The nucleus is negatively charged.

Answer 24

false

Question 25

In the chemical symbol for hydrogen, what does the +1 refer to?

Answer 25

charge

Question 26

How are isotopes different from their original element?

Answer 26

Isotopes have a different number of neutrons.

Question 27

Which series is correct for fluorine-19?

Answer 27

9 protons, 9 electrons, 10 neutrons, atomic number 9, mass number 19

Question 28

What is the average atomic mass of beryllium?

Answer 28

9.0122amu

Question 29

What is the average atomic mass of nitrogen?

Answer 29

14.006amu

Question 30

Suppose that naturally occurring rubidium with an average atomic mass of 85.468 amu has 2 isotopes, Rubidium-85 and Rubidium-87 with atomic masses 84.911 amu and 86.909 amu, respectively. What is the percent abundance of Rubidium-85?

Answer 30

72%

Question 31

The periodic table is arranged in order by increasing...

Answer 31

atomic number

Question 32

Which is not displayed for each element in the periodic table?

Answer 32

isotope numbers

Question 33

The atomic number is equal to the number of electrons in an element.

Answer 33

false

Question 34

The rows in the periodic table are called...

Answer 34

periods

Question 35

Which is not considered a main group in the periodic table?

Answer 35

lanthanides

Question 36

Who is often considered to be the father of atomic theory?

Answer 36

Dalton

Question 37

Which postulate of Dalton’s atomic theory was proven wrong?

Answer 37

all matter is composed of atoms which are indivisible

Question 38

Which is not a postulate of Dalton’s atomic theory?

Answer 38

atoms can be broken into smaller pieces

Question 39

When was the atom discovered?

Answer 39

the 5th century BCE

Question 40

Why were two postulates of Dalton’s atomic theory proven wrong?

Answer 40

it was discovered that elements can have isotopes

Question 41

Which subatomic particle is positively charged?

Answer 41

proton

Question 42

Which experiment contributed to the discovery that atoms are mostly empty space?

Answer 42

gold-foil

Question 43

Which scientist conducted the oil drop experiment?

Answer 43

Millikan

Question 44

Which experiment calculated the charge of a single electron?

Answer 44

oil drop

Question 45

Which proposed model of the atom included a small positively charged nucleus?

Answer 45

Rutherford's model

Question 46

Calculate the mass number of an atom with 10 protons, 9 neutrons, and 10 electrons.

Answer 46

19

Question 47

Which subatomic particle is negative?

Answer 47

electron

Question 48

Which subatomic particle is the least massive?

Answer 48

electron

Question 49

How many protons are in the following chemical symbol: lithium?

Answer 49

3

Question 50

What is the atomic number of the following chemical symbol: Carbon?

Answer 50

6

Question 51

The atomic number is...

Answer 51

the number of protons in an atom.

Question 52

__________ is the total number of protons and neutrons in an atom.

Answer 52

mass number

Question 53

Which of the following is not necessary information for calculating percentage abundance?

Answer 53

natural abundance

Question 54

An isotope contains different numbers of…

Answer 54

neutrons

Question 55

Which element has only one isotope?

Answer 55

fluorine

Question 56

Carbon is a...

Answer 56

nonmetal

Question 57

The periodic table was invented by...

Answer 57

Mendeleev

Question 58

Where are the radioactive elements located on the periodic table?

Answer 58

actinides

Question 59

Which is not a region of the periodic table?

Answer 59

periodic law

Question 60

How is the modern periodic table organized?

Answer 60

atomic number