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?

   • Calcium, element 20
   • Scandium, element 21
   • Zirconium, element 40, from the mass number
   • Argon, element 18
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
   • Neon, element 10
   • Sodium, element 11
   • Magnesium, element 12, from the neutrons
5. 4.

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

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

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

   • Sulfur, next to chlorine in period 3
   • Gold
   • Iodine, in the same group
   • Iron, also in period 4
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 sits in an earlier period
   • It has less mass
8. 7.

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

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

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?

    • Disagree: they are nonmetals
    • Agree: they are shiny
    • 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 metals are on the right
    • A metalloid
    • A metal
    • A nonmetal, since it is a liquid
12. 10.

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

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