10. Isotopes of Neon (Just the Nucleuses) 10 Neutrons 10 Protons 12 Neutrons 10 Protons Net Charge of Atom is Still Neutral Pages 197-198 Contrast = To Show Differences When Compared
All atoms of the same element have the same number of protons.
How many elements are in the first row of the period table? (Answer: 2) How many elements are in the second and third rows? (Answer: 8).
This image is from your text (which means the answers are also in your text). The LIGHT BLUE tiles represent elements classified as METALS. The tiles that are YELLOW are called NONMETALS and the tiles that are between the METALS and NONMENTALS are the SEMIMETALS which are LIGHT GREEN. Go ahead and shade and label your model in your notes. Be colorful!
The number after the element name is the atomic mass (rounded to the nearest whole number). Remember, electron mass is so tiny that we don’t count it when determining the mass of an atom.
Radioactive tracers examples are iodine-131, gadolinium-153 (atomic number 64), and technetium-99. Cobalt-60 is used to treat cancer.
Hydrogen (pure, no isotope) is some times called protium because it only has one proton and no neutron. Protium, deuterium and tritium are the only isotopes of any element that have special names. Scientists use deuterium to study chemical reactions.
Calcium looses 2 electrons to become a positive ion with a charge of plus 2.
Calcium looses 2 electrons to become a positive ion with a charge of plus 2.
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