Chapter 2 Flashcards
Where are the subatomic particles located in the atom?
In the nucleus
How does the mass of an electron compare to the mass of a proton?
The mass of an electron is about 2000 times smaller than that of a proton.
The subatomic particles that make up all atoms
Proton, electron, neutron
The charge and relative mass associated with each particle
Protons —- positive charge
Electrons—negative charge
Neutrons—no charge
Proton and Neutron— relative mass of 1amu each
Electron 1/2000 of an amu and doesn’t contribute significantly to the mass.
what units are used for describing the mass of a proton or neutron?
AMU (atomic mass unit)
What do the atomic number and mass number indicate?
The atomic number of an atom indicates the number of protons in the atom.
The mass number of an atom is the total number of protons and neutrons present in a given atom of an element.
How can you determine the number of protons present in an atom
The atomic number
How can you determine the number of neutrons present in an atom
The mass number minus the atomic number
How can you determine the number of electrons present in an atom
Is the same number as the number of protons
What is the mass number for an oxygen atom(O x/8) that contains 8 neurons?
16
Determine the number of protons, neutrons, and electrons for an iodine atom that has a mass number of 131
I: Atomic number 53
P 53
N 78
E 53
Determine the number of protons, neutrons, and electrons for a potassium atom that has a mass number of 39. K19
P: 19
N: 20
E: 19
Write the symbolic notation for atoms with 5 protons and 6 neutrons
11B
5
Write the symbolic notation for atoms with 35 protons and 46 neutrons
81
35Br
Write the symbolic notation for atoms with 14 protons and 14 neutrons
28
14Si
Write the symbolic notation for atoms with 54 protons and 70 neutrons
124
54 Xe
Determine the protons, neutrons, and electrons for 18/8 O
P: 8
N:10
E:8
Determine the protons, neutrons, and electrons for 40/20 Ca
P: 20
N:20
E: 20
Determine the protons, neutrons, and electrons for 108/47 Ag
P: 47
N : 61
E: 47
Ag Silver
Determine the protons, neutrons, and electrons for 207/82 Pb
P 82
N 125
E 82
Pb: Lead
Isotopes
Atoms of the same element with different mass number
Isotope have the same number of protons(same atomic number), but different
Number of neutrons (therefor different mass number).
Copper has two naturally occurring isotopes: copper-63 and copper-65.
Based on the atomic mass from the periodic table which of these is more abundant?
Cu (atomic number 29, 63.55amu)
A: copper-63
What is the difference between the mass number for an isotope and the atomic mass of an element?
The mass number is the sum of protons and neutrons for a given isotope.
The atomic mass is the average atomic mass for all the isotopes of an element found in nature.
