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Flashcards

Elements and atoms

Kayla Mackel Science 8th grade English 50 cards

Cards in this deck (50)

  1. 1The Positively charged particle that is located in the nucleus of an atom is a what?A proton
  2. 2The passage of an electric current through a gas was used by J.J. Thomas in experiments that led to the discovery of the what?The Electron
  3. 3The nucleus of an atom was first discovered by who?Rutherford
  4. 4The theory that electrons orbit the nucleus was first proposed by who?Bohr
  5. 5The number of protons in the nucleus of an atom is called the what?Atomic Number
  6. 6the sum of the protons and neutrons in the nucleus of an atom is called the what?Mass Number
  7. 7Radioactive decay is caused by what force?Weak force
  8. 8Particles smaller than the atom are called what?Subatomic Particles
  9. 9The nucleus of a atom contains what?protons and Nuetrons
  10. 10The number of protons in an atom with an atomic mass of 18 is what?18
  11. 11An isotope of oxygen, atomic number 8, could have what?8 protons and 10 neutrons
  12. 12All nuclear particles are thought to be made of a combination of three what?Quarks
  13. 13Which of the following forces within the atom is responsible for keeping the electrons in orbit around the nucleus?electromagnetic Force
  14. 14Mendeleev's periodic table arranged the known elements in order of what?Increasing Atomic mass
  15. 15The Modern periodic table is in order by what?Increasing atomic number
  16. 16The ______ is the center of the atomNucleus
  17. 17Atoms of the same element that have the same number of protons but different numbers of of neutrons is called an ______Isotope
  18. 18The subatomic particle that is neutral is the _________Nuetron
  19. 19A(an) __________ is a negatively charged particle.Electron
  20. 20The unit used to calculate the mass of an atom is the __________ __________ unitAtomic mass
  21. 21The elements in a vertical column on the periodic table form a _______Group
  22. 22The elements in a horizontal row of the periodic table form a ________Period
  23. 23Two different elements cannot have the same _______ ________.Atomic Number
  24. 24The _____________ are found next to the stair-step line on the periodic table.Metalloids
  25. 25_________ make up all known particles in the nucleusQuarks
  26. 26A ________ force "glues" the protons together in the nucleus.Strong
  27. 27___________________ force is the force attraction which exist between all objects in the universeGravity
  28. 28Particles smaller than an atom are called __________ particles.Subatomic
  29. 29the ________ number of an element never changesMass
  30. 30What chart are all of the elements shown?The Periodic Table
  31. 31Where are the electrons located in the atom?The electron Cloud
  32. 32the mass number of ________ is about equal to the mass of a proton.Nuetron
  33. 33The maximum number of electrons in the second energy level of an atom is ________.Eight
  34. 34AtAstatine (Non-Metal)
  35. 35BaBarium (Metal)
  36. 36KrKrypton (Non-Metal)
  37. 37A charged particle that forms when an atom or group of atoms gains or loses one or more electrons.Ion
  38. 38Who created the theory that matter was made of 4 elements (earth, fire, water, air.)Aristotle
  39. 39Who created the theory that matter is made of tiny particles which were indivisible. Atom came from the Greek word Atomon, meaning indivisible.Democritus
  40. 40Who created the theory that matter was made up of elementsRobert Boyle
  41. 41Who created the Atomic TheoryJohn Dalton
  42. 42What were the principles that made up the atomic theory?1) Matter is made of elements
    2) Atoms are indivisible
    3) Atoms that look alike make up the same atom
    4) Atoms that didn't look alike make up the same element
    5) Atoms are combined with other atoms in certain ratios
  43. 43Who discovered the electron using a Cathode Ray tube.William Crookies
  44. 44WHo discovered neutronsJames Chadwick
  45. 45What was the model called that concluded that atoms are mostly just empty space except for their very tiny nucleus. (Gold Foil experiment)The Wave Model
  46. 46The spot where electrons orbit the nucleus inside the atom.Electron Cloud
  47. 47Greatest of the 4 forces, hold neutrons together. Glues the protonsThe Strong Force
  48. 48Force responsible for the process of radioactive decay in the atom. It takes a neutron and makes it split up into another proton and electron (sun)Weak Force
  49. 49Weakest of the 4 forces. Attraction force between any object that has mass.Gravity
  50. 50Can repel or attract electrons are held in their energy levels by the ____________________ forceElectromagnetic

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8th grade Science Flashcards on Elements and atoms, created by Kayla Mackel on 07/11/2017.
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Kayla Mackel
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