ATOMIC STRUCTURE OF MATTER MULTIPLE CHOICE QUESTIONS

1.  The mass number of atoms is the number of _____________ in the atom.
          a.  protons
          b.  neutrons
          c.  protons plus the number of electrons
          d.  protons plus the number of neutrons
2.  What does the atomic number of an atom represent?
          a.  neutrons
          b.  protons
          c.  protons plus number of electrons
          d.  protons plus number of neutrons
3.  An atom of Na²³ isotope contains how many electrons?
          a.  23
          b.  11
          c.  10
          d.  13
4. It is a region of space in which there is a high probability of finding the electron in an atom.
          a.  shell
          b.  atomic orbital
          c.  nucleus
          d.  energy level
5.  What is the total number of orbitals in the fourth energy level?
          a.  4
          b.  24
          c.  16
          d.  9
6.  Which of the following elements has one valence electron?
          a.  lithium
          b.  boron
          c.  nitrogen
          d.  chlorine
7.  Which group of elements in the periodic table easily gain electrons?
          a.  alkali metals
          b.  halogens
          c.  noble gases
          d.  alkaline earth metals
8.  Which of the following elements  has the largest atomic radius?
          a.  Flourine
          b.  Nitrogen
          c.  Boron
          d.  Lithium
9.  Cations have
           a.  positive charge.
           b.  negative charge.
           c.  no charge.
           d.  positive and negative.
10.  The plum pudding model of an atom was formulated by:
          a.  Dalton
          b.  Democritus
          c.  Rutherford
          d.  J.J.  Thomson
11.  What subatomic particle has a mass of 1 atomic mass unit?
          a.  proton
          b.  neutron
          c.  electron
          d.  proton and neutron
12.  How many electrons does Zinc have?
          a.  26
          b.  30
          c.  65
          d.  56
13.  An orbital can hold:
          a.  a maximum of one electron each.
          b.  a maximum of two electron each.
          c.  a number of electrons that depends on the energy level.
          d.  a number of electrons that depends on the kind of orbitals.
14.  Which type of orbital looks like a figure 8 when drawn?
          a.  s-orbital
          b.  p-orbital
          c.  d-orbital
          d.  f-orbital
15.  Which of the following has low melting point?
          a.  metals
          b.  nonmetals
          c.  metalloids
          d.  transition metals
16.  The colors of light given off when a sample is heated, corresponds to:
          a.  The energy difference between the ground state and excited state of an element.
          b.  The amount of energy added to the sample.
          c.  The energy from the energy level.
          d.  The heat of the element
17.  Line spectra is caused primarily by:
          a.  the existence of many ground state in an atom.
          b.  the existence of many excited states in an atom.
          c.  the existence of many atoms in a typical sample.
          d.  None of the above.
18.  Bohr  model of an atom was able to accurately explain :
          a.  Why spectral lines appear when atoms are heated.
          b.  The energies of spectral lines for each element.
          c.  Why electrons travel in a circular orbit around the nucleus.
          d.  none of the above.
19.  Mass spectrometer separate isotopes of different elements based on their:
          a.  mass
          b.  electric charge
          c.  mass divided by electric charge
          d.  none of the above
20.  What percent of atoms of magnesium has a mass of exactly 24 amu?
          a.  100%
          b.  70%
          c.  30%
          d.  0%