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Atoms 1
Atoms 2
Atoms 3
Atoms 4
Atoms 5
100
The smallest particle of an element that retains the properties of that element is a(n) ____.
Atom
100
The nucleus of an atom is ____. a.) the central core and is composed of protons and neutrons b.) positively charged and has more protons than neutrons c.) negatively charged and has a high density d.) negatively charged and has a low density
a. the central core and is composed of protons and neutrons
100
All atoms of the same element have the same ____.
number of protons
100
Using the periodic table, determine the number of neutrons in O-16.
8
100
Find the number of neutrons in Fe-55
29
200
Dalton's atomic theory included which idea? a.) All atoms of all elements are the same size. b.) Atoms of different elements always combine in one-to-one ratios. c.) Atoms of the same element are always identical. d.) Individual atoms can be seen with a microscope.
c. Atoms of the same element are always identical.
200
The atomic number of an element is the total number of which particles in the nucleus?
protons
200
Isotopes of the same element have different ____.
number of neutrons
200
How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?
50 protons, 50 electrons, 75 neutrons
200
What unit is used to measure weighted average atomic mass?
Amu
300
All atoms are ____.
neutral, with the number of protons equaling the number of electrons
300
An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.
76 protons and 76 electrons
300
Isotopes of the same element have different ____.
mass numbers
300
TRUE OR FALSE: ?The number of neutrons is the same as the number of electrons.
False: The number of Protons is the same as the number of electrons.
300
Which of the following statements is NOT true? a.) Protons have a positive charge. b.) Electrons are negatively charged and have a mass of 1 amu. c.) The nucleus of an atom is positively charged. d.) Neutrons are located in the nucleus of an atom.
b. Electrons are negatively charged and have a mass of 1 amu.
400
The particles that are found in the nucleus of an atom are ____.
Protons and Neutrons
400
The sum of the protons and neutrons in an atom equals the ____.
mass number
400
In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly? a.) In, 49 protons, 49 electrons b.) Cs, 55 protons, 132.9 electrons c.) Zn, 30 protons, 60 electrons d.) F, 19 protons, 19 electrons
a. In, 49 protons, 49 electrons
400
How is the number of neutrons in the nucleus of an atom calculated?
Mass Number - Atomic Number OR Mass number - Number of Protons
400
The atomic mass of an element is the ____.
weighted average of the masses of the isotopes of the element
500
As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true? a.) Protons, electrons, and neutrons are evenly distributed throughout the volume of the atom. b.) The nucleus is made of protons, electrons, and neutrons. c.) Electrons are distributed around the nucleus and occupy almost all the volume of the atom. d.) The nucleus is made of electrons and protons.
c. Electrons are distributed around the nucleus and occupy almost all the volume of the atom.
500
What does the number 84 in the name krypton-84 represent?
the mass number
500
The mass number of an element is equal to ____.
the total number of protons and neutrons in the nucleus
500
Find the number of neutrons in Md-258
157
500
John Dalton used experimental methods to transform Democritus's ideas on atoms into a what?
Scientific Theory