How many subatomic particles does an atom with atomic number 50 and mass number 125 contain?

50 protons, 50 electrons, 75 neutrons

What distinguishes the atoms of one element from the atoms of another?

The number of protons in the nucleus

Dalton's atomic theory included which idea?

Atoms of the same element are always identical.

What evidence supported Ernest Rutherford's hypothesis of a + charge in a dense central core?

Au atoms could greatly deflect the path of alpha particles

How did Rutherford's expected outcome of the gold-foil experiment compare with the actual?

Alpha particles pass through the gold foil

How can electrons in an atom move from one energy level to another?

Gaining or losing a specific amount of energy or a quantum

According to Dalton's postulates, how do atoms relate to elements?

The atoms of one element differ from atoms of other elements

How does visible light differ from radio waves, microwaves, and the others of the EM spectrum?

VL has a different range of frequencies and wavelengths.

Which of the following is true about subatomic particles?

The mass of a neutron nearly equals the mass of a proton.

The atomic mass of oxygen is 15.999 amu. What does this value equal?

The weighted average mass of oxygen atoms in nature

Which hypothesis led to the discovery of the proton?

An atom loses an electron a + charged particle should remain

f of a microwave is 3.23 x 10–11 Hz. Using Planck's constant what can be calculated?

The energy of one photon of the microwave

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Ahhhhmazing Atoms

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Review of the atom, electron behavior, and periodic table basics.

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Questions 20

Answers

1
How many subatomic particles does an atom with atomic number 50 and mass number 125 contain?
50 protons, 50 electrons, 75 neutrons
120 neutrons, 50 protons, 75 electrons
70 neutrons, 75 protons, 50 electrons
75 electrons, 50 protons, 50 neutrons
2
What are quanta of light called?
Photons
Muons
Excitons
Protons
3
What distinguishes the atoms of one element from the atoms of another?
The number of neutrons in the nucleus
The total number of protons and neutrons in the nucleus
The total number of protons, neutrons, and electrons
The number of protons in the nucleus
4
What is the maximum number of electrons in the second principal energy level?
2
32
18
8
5
Dalton's atomic theory included which idea?
Individual atoms can be seen with a microscope.
Atoms of different elements combine in one to one ratios.
All atoms of all elements are the same size.
Atoms of the same element are always identical.
6
Nitrogen's isotopes: nitrogen-14 and nitrogen-15. How would you calculate atomic mass of N?
Both A and B
The mass, in amu, of an atom of each isotope
The number of protons in a nitrogen atom
The natural percent abundance of each isotope
7
What evidence supported Ernest Rutherford's hypothesis of a + charge in a dense central core?
Au atoms only slightly deflected the path of alpha particles
Au atoms could greatly deflect the path of alpha particles
Measurements of atomic mass of Au, Ag, and other elements
Observations that beta particles acted the same as electrons
8
How many electrons are in the highest occupied energy level of an element in Group 5A?
1
3
5
7
9
The atomic mass of carbon isotopes in amu is: (0.9889)(12.000) + (x)(13.003). Solve for x.
0.0111
0.4944
0.9889
0.1200
10
How did Rutherford's expected outcome of the gold-foil experiment compare with the actual?
Alpha particles pass through the gold foil
Alpha particles would be deflected by the gold foil
Alpha particles would be absorbed by the gold foil
There was no outcome from the experiment.
11
How can electrons in an atom move from one energy level to another?
Colliding with the nucleus, without a gain or loss of energy
Gaining or losing any amount of energy
Colliding with other electrons without a change of energy
Gaining or losing a specific amount of energy or a quantum
12
What is the next atomic orbital in the series 1s, 2s, 2p, 3s, 3p?
2d
3d
4s
3f
13
According to Dalton's postulates, how do atoms relate to elements?
None of the above
The same atom may be part of two or more elements.
Elements are composed of atoms, and all atoms are identical.
The atoms of one element differ from atoms of other elements
14
How does visible light differ from radio waves, microwaves, and the others of the EM spectrum?
VL travels at a faster speed
VL exists as waves, while the others exist as particles
VL consists of particles, while the others exist as waves.
VL has a different range of frequencies and wavelengths.
15
Which of the following is true about subatomic particles?
Protons are + charged & the lightest subatomic particle.
The mass of a neutron nearly equals the mass of a proton.
Electrons are - charged and the heaviest subatomic particle.
Neutrons have no charge & the lightest subatomic particle
16
The atomic mass of oxygen is 15.999 amu. What does this value equal?
The mass of a randomly chosen oxygen atom
The mass of a randomly chosen oxygen atom
The mass of an atom of the most common oxygen isotope
The weighted average mass of oxygen atoms in nature
17
Isotopes of the same element have different ______?
Chemical behavior
Positions on the periodic table
Atomic numbers
Mass numbers
18
Which hypothesis led to the discovery of the proton?
The nucleus of an atom should contain neutrons.
An atom loses an electron a + charged particle should remain
Cathode rays should be attracted to a + charged plate
A proton should be 1840 times heavier than an electron.
19
What is the electron configuration of an arsenic atom in the ground state?
1s22s22p63s23p63d104s24p3
1s22s22p63s23p63d104s14p4
1s22s22p63s23p63d124s24p1
1s22s22p63s23p63d104s24p1
20
f of a microwave is 3.23 x 10^–11 Hz. Using Planck's constant what can be calculated?
The wavelength of the microwave transmission
The speed of the microwave transmission
The energy of one photon of the microwave
Max distance the transmission may travel through empty space

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