AnswersCR Chemistry S1 Q3050OXPeriodic Trends

Periodic Trends — Unit test Answers

13 verified answers3 views
21
Free Preview

Iron, an element with the chemical symbol Fe, is an important element. It is used to make steel and is part of the substance that transports oxygen throughout the human body.Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?

A
The element iron is composed of small particles called atoms.
B
The electrons of iron have probable locations in a region of space around the nucleus.
C
Iron atoms combine with other atoms in whole number ratios to form compounds.
D
Chemical reactions that involve iron do not create new atoms of iron.
22
Free Preview

How did Niels Bohr describe electrons in his atomic model?

A
Their energies can have any values.
B
Their exact positions cannot be known.
C
They have high probability to be found in certain regions.
D
They orbit the central nucleus in discrete paths.
23

Among the elements of the main group, the general trend in the first ionization energy moving across a period is not followed between group 2 and group 13. Which best explains these exceptions?

A
The ionization energy decreases because the full s orbital shields the electron entering the p orbital.
B
The ionization energy increases because the full s orbital shields the electron entering the p orbital.
C
The ionization energy decreases because the stability of the half-full p subshell is increased.
D
The ionization energy increases because the stability of the half-full p subshell is increased.
24

What is the atomic number of zirconium?

A
39
B
40
C
41
D
42
25

Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide. Which statement best describes these three components of air?

A
Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
B
Oxygen, nitrogen, and carbon dioxide cannot react with another substance.
C
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
D
Oxygen, nitrogen, and carbon dioxide can be classified as elements.
26

Which element is classified as an alkali metal?

A
Rb
B
Sr
C
Zr
D
Cl
27

Which statement best describes how electrons fill orbitals in the periodic table?

A
Electrons fill orbitals in order of their increasing energy from left to right.
B
Electrons fill orbitals in order of their increasing energy from right to left.
C
Elements fill orbitals in order of increasing energy from top to bottom in each group.
D
Elements fill orbitals in order of increasing energy from bottom to top in each group.
28

What did Ernest Rutherford’s gold foil experiment demonstrate about an atom?

A
Each atom is composed of electrons and positive material.
B
The mass of the atom is evenly spread throughout the atom.
C
Neutrons are located in the center of the atom.
D
Positive charge occupies a very small volume in the atom.
29

Which scientist is known for developing the planetary model of the atom?

A
Niels Bohr
B
Albert Einstein
C
Johannes Rydberg
D
Robert Millikan
30

Which best explains why ionization energy tends to decrease from the top to the bottom of a group?

A
The number of orbitals decreases.
B
The number of neutrons decreases.
C
Electrons get closer to the nucleus.
D
Electrons get farther from the nucleus.
31

Which of Dalton's ideas about the atom did J.J. Thomson's experiment disprove?

A
It disproved that atoms are divisible.
B
It disproved that atoms are indivisible.
C
It disproved that atoms contain protons.
D
It disproved that atoms contain electrons.
32

Which element has the largest atomic radius?

A
As
B
N
C
P
D
Sb

Did you find these answers helpful?

More from this Course

Quiz
20 verified answers

Unit Test

Quiz
25 verified answers

Unit Test

Quiz
42 verified answers

Unit Test