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?

   • You need the electrons to tell
   • Fluorine, element 9
   • Neon, element 10, from the neutrons
   • 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
   • Scandium, element 21
   • Calcium, element 20
   • Zirconium, element 40, from the mass number
4. 3.

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

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

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

   • Potassium, in the same group
   • Helium
   • Beryllium, its neighbor in period 2
   • Carbon, also in period 2
6. 5.

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

   • Lithium, the next element
   • Hydrogen, also in period 1
   • Neon, in the same group
   • Beryllium
7. 6.

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

   • Iodine, in the same group
   • Iron, also in period 4
   • Gold
   • Sulfur, next to chlorine in period 3
8. 7.

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

   • Disagree: the order is alphabetical
   • Disagree: tellurium is heavier yet comes first
   • Agree: heavier ones come later
   • Agree: 127.6 comes after 126.9
9. 8.

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

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

10. 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.

11. 9.

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

    • Disagree: they are metalloids
    • Agree: the right side is the metal side
    • Disagree: they are nonmetals
    • Agree: they are shiny
12. 10.

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

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