Atoms with the same atomic number (same number of protons) belong to the same element.
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Mass number = neutrons + protons
= 21
Atomic number = protons = 9
Neutral atom (protons = electrons) => YES
Electronic configuration = 2,7
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Mass number = neutrons + protons
= 27
Atomic number = protons = 13
Neutral atom (protons = electrons) => NO
Electronic configuration = 2,8,3
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Mass number = neutrons + protons
= 28
Atomic number = protons = 13
Neutral atom (protons = electrons) => YES
Electronic configuration = 2,8,3
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The atom Filling its energy levels. Exercises |
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1)An atom "X" has 13 electrons, 13 protons and 15 neutrons a) What is its
atomic mass? |
Solution |
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2)An atom "Y" has 10 electrons, 13 protons and 14 neutrons a) What is its
atomic mass? |
Solution |
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3)An atom "Y" has 9 electrons, 9 protons and 12 neutrons a) What is its
atomic mass? |
Solution |
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4)Are atoms "X" and "Y" from the same element? Explain. |
Solution |