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- Multiple ChoicePlease save your changes before editing any questions.
What is the trend of valence electrons, from left to right, across a row of the periodic table?
They increase across the period.
They are all equal across the period.
They are equal to an atomic number.
They are equal to the number of the period.
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The number of protons in one atom of an element determines the atom’s_____.
Mass
Atomic Number
Weight
Charge
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He proposed that all matter is composed of tiny invisible particles called “atomos”
Democritus
Neils Bohr
John Dalton
Thales
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He discovered the electron through a cathode test tube to study the nature of electric discharges.
J. J Thompson
James Chadwick
John Dalton
Neils Bohr
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All of the following are the subatomic particles of an atom except.
Proton
Electron
Neutron
Cation
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The most abundant element in the universe is________.
hydrogen
helium
carbon
nitrogen
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The man that proved the existence of neutron in 1932.
J. J Thompson
James Chadwick
John Dalton
Neils Bohr
- Multiple ChoicePlease save your changes before editing any questions.
The negatively charged particle of an atom is_______.
electron
neutron
proton
isotope
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Stars, like our Sun, generate energy by nuclear fusion. Which element is formed when hydrogen nuclei is fused during nuclear fusion?
Hydrogen
Oxygen
Helium
Carbon
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The two elements created at the beginning of the universe are_________.
hydrogen & helium
hydrogen & carbon
helium & oxygen
carbon & nitrogen
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The formation of the elements is known as _______________.
Nucleotides
Nuclear Fission
Synthogenesis
Nucleosynthesis
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following is NOT an evidence of star formation?
Hydrogen
Helium
Infrared Radiation
Rocks
- Multiple ChoicePlease save your changes before editing any questions.
How many types of nucleosynthesis are there?
1
2
3
4
- Multiple ChoicePlease save your changes before editing any questions.
Which process produced Star’s energy?
combustion
decomposition
nuclear fission
nuclear fusion
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The first elements were formed in what is known as _____________.
Big Bang Nucleosynthesis
Supernova Nucleosynthesis
Stellar Nucleosynthesis
Star Nucleosynthesis
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Which of the following gases are major components of star?
carbon and oxygen
helium and carbon
hydrogen and carbon
hydrogen and helium
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An _______________is the smallest particle of an element that retains the chemical properties of the element.
nucleus
molecule
atom
subatomic
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The ______________is a very small region located in the center of the atom.
nucleus
atom
molecule
subatomic
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The nucleus is made up of at least one positively charged particle called a ____________.
electron
neutron
axon
proton
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Usually one or more neutral particles called__________________is inside the nucleus of an atom.
neutron
proton
electron
axon
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Surrounding the nucleus is a region occupied by negatively charged particles called______________.
electron cloud
neutron
proton
electron
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Protons, neutrons, and electrons are often referred to as_________________particles.
sub-atom
sub-atomic
sub-molecule
sub-matter
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Thomson’s ______________experiments measured the charge-to-mass ratio of an electron.
Gold foil
Cathode-ray tube
Laboratory
Investigative
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A neutron has a _________________charge.
negative
positive
neutral
unidentified
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Each element has a different number of _______________in their nucleus.
proton
electron
neutron
nuclei
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________________is the combination of an atom.
particles
nuclei
molecule
matter
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TRUE or FALSE:
“A”is pointing to electron and its charge is negative.
TRUE
FALSE
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TRUE or FALSE:
“B”is pointing to nucleus and its charge is positive.
TRUE
FALSE
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TRUE or FALSE:
“C”is pointing to proton and its charge is positive.
TRUE
FALSE
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TRUE or FALSE:
“D”is pointing to neutron and its charge is neutral.
TRUE
FALSE
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Combinations of electron, proton & neutron.
Protons
molecule
Electron
Compound
Atoms
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Combination of atoms.
Atoms
molecule
Compound
Electron
Protons
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Combination of atoms and molecules.
Electron
Protons
molecule
Atoms
Compound
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Positively charged particles.
Compound
Atoms
molecule
Protons
Electron
- Multiple ChoicePlease save your changes before editing any questions.
Negatively charged particles.
Electron
Protons
molecule
Atoms
Compound