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LRA 211 Questions and Correct Answers
the basic building block of matter, described as having three
fundamental components: electrons, neutrons, and protons Ans:
atom
The number of protons in the nucleus of an atom, which also
indicates the number of electrons in a stable atom. Ans: atomic
number
Refers to the strong nuclear force that creates a very strong
attraction in the nucleus, overcoming the natural tendency for like
charges to repel. Ans: Binding Energy
Correct match:
A molecule that contains at least two different elements. Ans:
Compound
A bond based on two atoms sharing electrons that then orbit both
nuclei, completing the outermost shell of each. Ans: Covalent
Bond
A subatomic particle with one unit of negative electrical charge
and a mass significantly less than that of protons or neutrons,
orbiting the nucleus at high velocities. Ans: Electron
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Defined energy levels at different distances from the nucleus,
where electrons orbit three dimensionally around the nucleus Ans:
Electron Shell
A bond based on the attraction between atoms of opposite charge,
occurring when one atom gives up an electron (becoming a cation
with a net positive charge) and another atom takes on that
electron (becoming an anion with a net negative charge). Ans:
Ionic Bond
Formed when two or more atoms join together chemically. Ans:
Molecule
A component of the nucleus with no electrical charge and a
specific mass, contributing to the majority of an atom's mass
along with protons. Ans: Neutron
The central part of an atom, made up of protons and neutrons
(collectively called nucleons) and is the core around which
electrons orbit. Ans: Nucleus
Correct match:
A component of the nucleus with one unit of positive electrical
charge and a specific mass, contributing to the atomic number of
an atom. Ans: Proton
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1913- discovered that electrons move around the nucleus in orbits
called electron shells. Ans: Niels Bohr
discovered the nucleus Ans: Ernest Rutherford
k Ans: what is the inner shell?
L Ans: what is the midshell?
M Ans: what is the last shell?
Physical particles originating from radioactive atoms, composed of
two protons and two neutrons (the same makeup of the nucleus of
a helium atom), with a net positive charge. Ans: Alpha Particles
Electrons emitted from an unstable nucleus; they do not originate
in an electron shell. Ans: Beta Particles
An electric and magnetic disturbance traveling through space at
the speed of light, carrying energy in waves. It varies only in
energy, wavelength, and frequency but has no mass. Ans:
Electromagnetic Radiation
A classification of electromagnetic radiations according to their
energy, wavelength, and frequency, ranging from radiowaves to
gamma rays. Ans: Electromagnetic Spectrum
© 2025 All rights reserved
LRA 211 Questions and Correct Answers
the basic building block of matter, described as having three
fundamental components: electrons, neutrons, and protons Ans:
atom
The number of protons in the nucleus of an atom, which also
indicates the number of electrons in a stable atom. Ans: atomic
number
Refers to the strong nuclear force that creates a very strong
attraction in the nucleus, overcoming the natural tendency for like
charges to repel. Ans: Binding Energy
Correct match:
A molecule that contains at least two different elements. Ans:
Compound
A bond based on two atoms sharing electrons that then orbit both
nuclei, completing the outermost shell of each. Ans: Covalent
Bond
A subatomic particle with one unit of negative electrical charge
and a mass significantly less than that of protons or neutrons,
orbiting the nucleus at high velocities. Ans: Electron
© 2025 All rights reserved
, 2 | Page
Defined energy levels at different distances from the nucleus,
where electrons orbit three dimensionally around the nucleus Ans:
Electron Shell
A bond based on the attraction between atoms of opposite charge,
occurring when one atom gives up an electron (becoming a cation
with a net positive charge) and another atom takes on that
electron (becoming an anion with a net negative charge). Ans:
Ionic Bond
Formed when two or more atoms join together chemically. Ans:
Molecule
A component of the nucleus with no electrical charge and a
specific mass, contributing to the majority of an atom's mass
along with protons. Ans: Neutron
The central part of an atom, made up of protons and neutrons
(collectively called nucleons) and is the core around which
electrons orbit. Ans: Nucleus
Correct match:
A component of the nucleus with one unit of positive electrical
charge and a specific mass, contributing to the atomic number of
an atom. Ans: Proton
© 2025 All rights reserved
, 3 | Page
1913- discovered that electrons move around the nucleus in orbits
called electron shells. Ans: Niels Bohr
discovered the nucleus Ans: Ernest Rutherford
k Ans: what is the inner shell?
L Ans: what is the midshell?
M Ans: what is the last shell?
Physical particles originating from radioactive atoms, composed of
two protons and two neutrons (the same makeup of the nucleus of
a helium atom), with a net positive charge. Ans: Alpha Particles
Electrons emitted from an unstable nucleus; they do not originate
in an electron shell. Ans: Beta Particles
An electric and magnetic disturbance traveling through space at
the speed of light, carrying energy in waves. It varies only in
energy, wavelength, and frequency but has no mass. Ans:
Electromagnetic Radiation
A classification of electromagnetic radiations according to their
energy, wavelength, and frequency, ranging from radiowaves to
gamma rays. Ans: Electromagnetic Spectrum
© 2025 All rights reserved
