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?

   • Potassium, element 19, from the mass number
   • You need the electrons to tell
   • Neon, element 10, from the neutrons
   • Fluorine, element 9
2. 2.

   “Particle drawing of an atom, not to scale:” Esme's atom drawing (not to scale) shows 11 protons and 12 neutrons. Which element matches it?

   • Neon, element 10
   • Vanadium, element 23, from the mass number
   • Sodium, element 11
   • Magnesium, element 12, from the neutrons
3. 3.

   Lithium is a soft, shiny metal that tarnishes quickly in air. Which element is most likely to be like it, Jun?

   • Helium
   • Beryllium, its neighbor in period 2
   • Potassium, in the same group
   • Carbon, also in period 2
4. 4.

   Helium is a gas that hardly ever reacts. Which element is most likely to be like it, Kira?

   • Beryllium
   • Hydrogen, also in period 1
   • Neon, in the same group
   • Lithium, the next element
5. 5.

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

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

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

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

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

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

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

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

9. Read this first

   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. 9.

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

    • Agree: the right side is the metal side
    • Agree: they are shiny
    • Disagree: they are metalloids
    • Disagree: they are nonmetals
11. 10.

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

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