atomic structure assessment* ch 4

Pg 112 :

28.  All matter is composed of atoms which contains protons, neutrons, and electrons in the nucleus

35. the cathode ray

39. The electrons stay confined in the nucleus because they are negative, and the protons are positive which attract. So the electromagnetic force cause them to stay.

40. The tube is filled with low pressured gas so its not like its hectic in their. The particles connect to the opposite charges as the voltage and magnetic force runs.

50. The superscript in the notation represents the mass number and the subscript stands for the atomic number.

51. You know the mass number and atomic number but how do you find out the number of neutrons? Well  if you have those two things, you take the subtract the atomic number to the mass number which will figure out the number of neutrons.

60.  Vanadium (V) protons: 23 electrons: 23----> Manganese (Mn) protons: 25 electrons:25----> Iridium (Ir) protons: 77 electrons: 77----> Sulfur (S) protons:16 electrons: 16

64. Cs- protons & electrons: 55 neutrons: 80

      Co- protons & electrons: 27 neutrons: 32

      Tm- protons & electrons: 69 neutrons: 94

      Zn- protons & electrons: 30 neutrons: 50

65. a: 31 protons & electrons, 33 neutrons
      b. 9 protons & electrons, 14 neutrons
      c. 22 protons & electrons, 26 neutrons
      d 2 protons & electrons, 6 neutrons
68. percent abundance (mass) = atomic mass. .  51.992
85.  You cannot  pass your hand through an solid object even though atoms are primarily composed of empty space just because they are all connect in place vibrating.