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Isotopes/Molecules/Compounds, Select true or false for the

following questions:
Isotopes are atoms of the same element, with a different number of protons. ___
Unstable isotopes emit energy called radiation.
___
Radiation is good for cells, preventing cancer.
___
A molecule is simply atoms bonded together. ___
A compound is when two or more atoms of different elements chemically combine.
___
Atom Bonding, Fill in the blank for the following questions:
Electrons orbit around the nucleus in __________.
Atoms are most stable when their outer electron shell, the
__________
shell is full.
For atoms with atomic numbers of 18 elements or less, the first shell can only hold up to
__________
electrons. Then the second and third shell can hold up to
__________
electrons.
Ions are
__________ charged atoms because it has gained or lost one or more electrons.
Cations are
__________ charged because they have
__________
electrons.
Anions are
__________ charged because they have
__________
electrons.
Therefore, an ionic bond is the attraction between a/an
__________
and a/an__________. In
which electrons are transferred.
A covalent bond on the other hand, are atoms that
__________
electrons to fill their valance
shells.
Polar molecules are a result of
__________
bonds. Where electrons are not shared equally.
Hydrogen bonds are weak attractions between the
__________
end of one polar molecule and
the
__________
end another polar molecule.
Electrolytes, Fill in the blank for the following questions:
Electrolytes are substances that release ions in __________.
Acids are substances that dissociate in water, releasing __________
ions (H+).
Bases are substances that release hydroxide ions (OH-), that can combine with
__________

1 answer

Sure, here are the answers based on your questions:

Isotopes/Molecules/Compounds: True or False

  1. Isotopes are atoms of the same element, with a different number of protons. False (Isotopes have the same number of protons but a different number of neutrons).
  2. Unstable isotopes emit energy called radiation. True
  3. Radiation is good for cells, preventing cancer. False (Radiation can be harmful to cells and is a known risk factor for cancer).
  4. A molecule is simply atoms bonded together. True
  5. A compound is when two or more atoms of different elements chemically combine. True

Atom Bonding: Fill in the blank

  1. Electrons orbit around the nucleus in energy levels (or shells).
  2. Atoms are most stable when their outer electron shell, the valence shell is full.
  3. For atoms with atomic numbers of 18 elements or less, the first shell can only hold up to 2 electrons. Then the second and third shells can hold up to 8 electrons.
  4. Ions are charged atoms because it has gained or lost one or more electrons.
  5. Cations are positively charged because they have lost electrons.
  6. Anions are negatively charged because they have gained electrons.
  7. Therefore, an ionic bond is the attraction between a/an cation and a/an anion in which electrons are transferred.
  8. A covalent bond on the other hand, are atoms that share electrons to fill their valence shells.
  9. Polar molecules are a result of covalent bonds, where electrons are not shared equally.
  10. Hydrogen bonds are weak attractions between the partial positive end of one polar molecule and the partial negative end of another polar molecule.

Electrolytes: Fill in the blank

  1. Electrolytes are substances that release ions in solution (or water).
  2. Acids are substances that dissociate in water, releasing hydrogen ions (H+).
  3. Bases are substances that release hydroxide ions (OH-), that can combine with hydrogen ions (H+).