AnswersChemistryAtomic Structure and the Periodic Table

Atomic Structure and the Periodic Table — Test Answers

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21
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Which element is the most reactive?

A
carbon
B
sodium
C
nickel
D
oxygen
22
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Which element has the largest atomic radius?

A
cap n
B
cap p
C
Sb
D
As
23

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
Chemical reactions that involve iron do not create new atoms of iron.
C
The electrons of iron have probable locations in a region of space around the nucleus.
D
Iron atoms combine with other atoms in whole number ratios to form compounds.
24

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
Electrons get farther from the nucleus.
C
The number of neutrons decreases.
D
Electrons get closer to the nucleus.
25

Which of these statements best identifies the particle that is labeled with an cap x ?

A
It is either an electron or a nucleus.
B
It is either a proton or a neutron.
C
It is either a nucleus or a proton.
D
It is either a neutron or an electron.

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