Presentation on theme: "Atoms are not indivisible and all atoms of an element are not identical 36. State the main points of Dalton’s atom theory using your own words. Which parts."— Presentation transcript:
Atoms are not indivisible and all atoms of an element are not identical 36. State the main points of Dalton’s atom theory using your own words. Which parts of Dalton’s theory were later found to be erroneous? Explain.
Protons and neutron; positive (charge equal to the number protons) 39. What particles are found in the nucleus of an atom? What is the charge of the nucleus?
The number of protons equals the number of electrons 44. Explain why atoms are electrically neutral.
Protons and neutrons 46. Which particles account for most of an atom’s mass?
Differ: number of neutrons, masses Similar: chemical properties, number of protons and electrons. 58. How do isotopes of a given element differ? How are they similar?
They are all equal. (when neutral) 59. How is an atom’s atomic number related to its number of protons? To its number of electrons?
Mass number = # of p + # of n 60. How is the mass number related to the number of protons and neutrons an atom has?
# of n = mass number - atomic number 61. How can you determine the number of neutrons in an atom if its mass number and its atomic number are known?
Superscript = mass number (40) (p + n) and subscript = atomic number (19) (p)
64. Are the following isotopes of each other? Explain. 24 25 26 MgMgMg 12 12 12 Yes. Isotopes are atoms of the same element with different atomic mass but the same number of protons
65.Does the existence of isotopes contradict part of Dalton’s original atomic theory? Explain. Yes. Not all atoms of an element are identical in mass.