Reading the periodic table

Grade 8 Science Worksheet - Challenge Me

Circle the best answer.

1. 1.

   a nucleus with 9 protons (marked +) and 10 neutrons (no mark). Ari's atom drawing (not to scale) shows 9 protons and 10 neutrons. Which element matches it?

   • Fluorine, element 9
   • Neon, element 10, from the neutrons
   • You need the electrons to tell
   • Potassium, element 19, from the mass number

2. Read this first

   Use this

   Particle drawing of an atom, not to scale:

3. 2.

   Bo's atom drawing (not to scale) shows 20 protons and 20 neutrons. Which element matches it?

   • Argon, element 18
   • Calcium, element 20
   • Zirconium, element 40, from the mass number
   • Scandium, element 21
4. 3.

   Esme's atom drawing (not to scale) shows 11 protons and 12 neutrons. Which element matches it?

   • Vanadium, element 23, from the mass number
   • Magnesium, element 12, from the neutrons
   • Neon, element 10
   • Sodium, element 11
5. 4.

   Chlorine and bromine behave alike. Which element should also behave like them, Luz?

   • Iron, also in period 4
   • Iodine, in the same group
   • Sulfur, next to chlorine in period 3
   • Gold
6. 5.

   Milo says the table is in order of mass. Using the tellurium and iodine tiles, agree or disagree?

   • Disagree: the order is alphabetical
   • Agree: 127.6 comes after 126.9
   • Disagree: tellurium is heavier yet comes first
   • Agree: heavier ones come later
7. 6.

   Using the cobalt and nickel tiles, why does cobalt come first, Noah?

   • It has a higher atomic number
   • It has fewer protons
   • It has less mass
   • It sits in an earlier period
8. 7.

   If the table were ordered by mass, what would happen to tellurium and iodine, Pia?

   • Tellurium would come first, as now
   • Nothing; that is the order now
   • Both would move to period 1
   • They would swap places

9. Use this

   Outline of the periodic table (IUPAC) with a thick staircase line from boron down to tellurium. Metals are shaded on the left and in the middle; nonmetals are unshaded on the right; the elements along the staircase (B, Si, Ge, As, Sb, Te) are dotted as metalloids. Hydrogen, at the top left, is unshaded.

10. 8.

    Ren says the elements to the right of the staircase are metals. Agree or disagree?

    • Agree: they are shiny
    • Disagree: they are nonmetals
    • Agree: the right side is the metal side
    • Disagree: they are metalloids
11. 9.

    Mercury is a liquid at room temperature and sits left of the staircase. What is it, Tala?

    • A nonmetal, since it is a liquid
    • A nonmetal, since metals are on the right
    • A metalloid
    • A metal
12. 10.

    Aluminum sits just left of the staircase. Zee must classify it. Which is right?

    • Metal
    • Nonmetal: metals are on the right
    • Nonmetal: it is light
    • Metalloid: it is on the staircase