Unit 2 and 3 Review (Atomic Structure and Periodic Table)

  1. What are the three subatomic particle found in an atom and what is their charge and mass?Proton – positive charge, 1 amu Neutron – no charge or neutral, 1 amu Electron – negative charge, almost 0 amu
  1. Electrons are found where in an atom? Outside the nucleus on the shells, energy levels, electron cloud
  1. What two subatomic particles make up the nucleus in an atom? Protons and neutrons
  1. How do you find the atomic number of an atom? Number of protons
  1. How do you find the atomic mass of an atom? Protons + neutrons
  1. How do you find the neutrons if you are not given a picture of the atom?

Atomic mass - protons

  1. The number of electrons in a stable atom are always the same as what other subatomic particle? Number of protons
  1. The electrons found on the outermost energy level are called______.

Valence electrons

  1. If an element’s atomic number is 10, how many protons is in this atom? 10
  1. If an atom has an atomic mass of 63 and 23 protons, how many neutrons is in this atom? 40 neutrons
  1. Groups on the periodic table are represented by what on an atomic structure?

Valence electrons

  1. Periods on the periodic table are represented by what on an atomic structure.

Energy levels/shells

  1. Elements that have similar chemical properties are found where on the periodic table?

Same group

  1. Groups go which way on the periodic table? Up and down
  1. Periods go which way on the periodic table?Left to right
  1. If an atom has 6 valence electrons, which group is the element found?Group 16
  1. If an atom has 2 shells/energy level, which period is the element found?Period 2
  1. If 5 elements were in the same group, they would have the same number of what? Valence electrons
  1. What group are the noble gases?Group 18
  1. Why are noble gases the least reactive group? Most number of valence electrons,

the most an atom can have 8

21. What group is the most reactive? Group 1

22.

What group is this element in? group 15

What period is this element in? period 4

Name this element. Arsenic

23. What are the metals, nonmetals and metalloids located on the periodic

table?Metals are left of metalloids, nonmetals are right of metalloids and metalloids

are on stairstep

24. List characteristics for metals, nonmetals and metalloids.

Metals – ductile, good conductors, malleable, solids

Nonmetals – brittle, mostly gases, poor conductors, good insulators

Metalloids – semiconductors, carry properties of both metals and nonmetals

25.

Is this element a metal, nonmetal or metalloid?nonmetal

26. What group has a complete level of valence electrons? Group 18