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- Multiple ChoicePlease save your changes before editing any questions.
Which statement describes the earliest model of the atom?
The atom is an indivisible hard sphere
An atom has a small, dense nucleus.
Electrons are negative particles in an atom.
Electrons in an atom have wave-like properties
- Multiple ChoicePlease save your changes before editing any questions.
In all atoms of bismuth, the number of electrons must equal the
number of protons
the number of neutrons
sum of the number of neutrons and protons
difference between the number of neutrons and protons
- Multiple ChoicePlease save your changes before editing any questions.
Which symbol represents a particle that has a mass approximately equal to the mass of a neutron?
a
B-
B+
p
- Multiple ChoicePlease save your changes before editing any questions.
An orbital is a region in an atom where there is a high probability of finding
an alpha particle
an electron
a neutron
a positron
- Multiple ChoicePlease save your changes before editing any questions.
Which element is classified as a metalloid?
boron
potassium
sulfur
xenon
- Multiple ChoicePlease save your changes before editing any questions.
Which notations represent atoms that have the same number of protons but a different number of neutrons
H-3 and He-3
S-32 and S-32
Cl-35 and Cl-37
Ga-70 and Ge-73
- Multiple ChoicePlease save your changes before editing any questions.
Which particles are found in the nucleus of an argon atom?
protons and electrons
positrons and neutrons
protons and neutrons
positrons and electrons
- Multiple ChoicePlease save your changes before editing any questions.
The mass of an electron is
equal to the mass of a proton
equal to the mass of a neutron
greater than the mass of a proton
less than the mass of a proton
less than the mass of a neutron
- Multiple ChoicePlease save your changes before editing any questions.
Which substance can not be broken down by a chemical change?
ammonia
magnesium
methane
water
- Multiple ChoicePlease save your changes before editing any questions.
The results of the gold foil experiment led to the conclusion that an atom is
mostly empty space and has a small, negatively charged nucleus
mostly empty space and has a small, positively charged nucleus
a hard sphere and has a large, negatively charged nucleus
a hard sphere and has a large, positively charged nucleus
- Multiple ChoicePlease save your changes before editing any questions.
Atoms are neutral because the number of
protons equals the number of neutrons
protons equals the number of electrons
neutrons is greater than the number of protons
neutrons is greater than the number of electrons
- Multiple ChoicePlease save your changes before editing any questions.
According to the wave-mechanical model of the atom, electrons are located in
orbitals
circular paths
a small, dense nucleus
a hard, indivisible sphere
- Multiple ChoicePlease save your changes before editing any questions.
The elements on the Periodic Table of the Elements are arranged in order of increasing
atomic number
mass number
number of neutrons
number of valence electrons
- Multiple ChoicePlease save your changes before editing any questions.
The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and
the same number of electrons per atom
the same number of neutrons per atom
a different number of electrons per atom
a different number of neutrons per atom
- Multiple ChoicePlease save your changes before editing any questions.
According to the wave-mechanical model, an orbital is defined as the most probable location of
a proton
a neutron
a positron
an electron
- Multiple ChoicePlease save your changes before editing any questions.
The part of an atom that has an overall positive charge is called
an electron
the nucleus
the first shell
the valence shell
- Multiple ChoicePlease save your changes before editing any questions.
The elements on the Periodic Table of the Elements are arranged in order of increasing
atomic mass
formula mass
atomic number
oxidation
- Multiple ChoicePlease save your changes before editing any questions.
Which element is classified as a metalloid?
Te
S
Hg
I
- Multiple ChoicePlease save your changes before editing any questions.
What is the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons
1+
2+
1-
2-
- Multiple ChoicePlease save your changes before editing any questions.
Which statement describes the charge and location of an electron in an atom?
An electron has a positive charge and is located outside the nucleus.
An electron has a positive charge and is located in the nucleus.
An electron has a negative charge and is located outside the nucleus.
An electron has a negative charge and is located in the nucleus.
- Multiple ChoicePlease save your changes before editing any questions.
Which statement explains why a xenon atom is electrically neutral?
The atom has fewer neutrons than electrons.
The atom has more protons than electrons.
The atom has the same number of neutrons and electrons.
The atom has the same number of protons and electrons.
- Multiple ChoicePlease save your changes before editing any questions.
If two atoms are isotopes of the same element, the two atoms must have
the same number of protons and the same number of neutrons
the same number of protons and a different number of neutrons
a different number of protons and the same number of neutrons
a different number of protons and a different number of neutrons
- Multiple ChoicePlease save your changes before editing any questions.
The weighted average of the atomic masses of the naturally occurring isotopes of an element is the
atomic mass of the element
atomic number of the element
mass number of each isotope
formula mass of each isotope
- Multiple ChoicePlease save your changes before editing any questions.
Which element is classified as a metalloid?
Cr
Cs
Sc
Si
- Multiple ChoicePlease save your changes before editing any questions.
What is the total number of neutrons in an atom of K-42?
19
20
23
42
- Multiple ChoicePlease save your changes before editing any questions.
Which statement describes the location of protons and neutrons in an atom of helium?
Protons and neutrons are in the nucleus.
Protons and neutrons are outside the nucleus.
Protons are outside the nucleus, and neutrons are in the nucleus.
Protons are in the nucleus, and neutrons are outside the nucleus.
- Multiple ChoicePlease save your changes before editing any questions.
Given a list of atomic model descriptions:
A: electron shells outside a central nucleus
B: hard, indivisible sphere
C: Mostly empty space
Which list of atomic model descriptions represents the order of historical development from the earliest to most recent?
A, B, C
A, C, B
B, C, A
B, A, C
- Multiple ChoicePlease save your changes before editing any questions.
Which list represents the classification of the elements nitrogen, neon, magnesium, and silicon, respectively?
metal, metalloid, nonmetal, noble gas
nonmetal, noble gas, metal, metalloid
nonmetal, metalloid, noble gas, metal
noble gas, metal, metalloid, nonmetal
- Multiple ChoicePlease save your changes before editing any questions.
The table below gives the atomic mass and the abundance of the two naturally occurring isotopes of boron.
(10.01 x 0.199) + (11.01 x 0.801)
(10.01 x 0.00199) + (11.01 x 0.0081)
(10.01 x 19.9) + (11.01 x 80.1)
(10.01 + 11.01)/2
- Multiple ChoicePlease save your changes before editing any questions.
Which substance can not be broken down by a chemical change?
ammonia
ethanol
tungsten
water