Answers26-27 WHS-Chemistry-1stSixWeeksThe Structure of the Atom

The Structure of the Atom Answers

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The table below gives some characteristics of element Y.Characteristics of element YValuesMass number11Number of neutrons in a single atom6Average atomic mass (grams/mole)10.81What is the identity of element Y?

A
C
B
B
C
Na
D
S
2
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A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?

A
–3
B
–2
C
0
D
+3
3

The mass number of Fe2+ is 56. How many neutrons are there in a single Fe2+ atom?

A
28
B
30
C
56
D
58
4

What is the charge on an electron?

A
–1
B
0
C
+1
D
+2
5

Which two particles are found in the nucleus of an atom?

A
neutrons and electrons
B
protons and electrons
C
protons and neutrons
D
neutrons and atoms
6

A lithium atom has three protons, three neutrons, and three electrons. What is the overall charge on this atom?

A
–3
B
0
C
+1
D
+3
7

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?

A
They both have seven protons in the nucleus.
B
They both have the same mass number.
C
They both have seven neutrons in the nucleus.
D
They both have the same atomic number.
8

Boron occurs naturally as two isotopes. What is the difference between these isotopes?

A
They have different numbers of electrons and different charges.
B
They have different numbers of neutrons and different charges.
C
They have different numbers of protons and different mass numbers.
D
They have different numbers of neutrons and different mass numbers.
9

In which of these statements are protons, electrons, and neutrons correctly compared?

A
Quarks are present in protons and neutrons but not in electrons.
B
Quarks are present in protons, neutrons, and electrons.
C
Quarks are present in neutrons and electrons but not in protons.
D
Quarks are present in protons and electrons but not in neutrons.
10

Which statement describes an electron?

A
It has a positive charge and is located in the nucleus.
B
It has a positive charge and is located in orbitals around the nucleus.
C
It has a negative charge and is located in the nucleus.
D
It has a negative charge and is located in orbitals around the nucleus.

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