Grade 10 · Science · Chemistry

10th grade How the periodic table was built and how it is arranged worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

Level: Building Confidence · On Level · Challenge Me

When it’s done, scan the sheet with your phone and PencilGo marks it and picks the next one. Create a free account

Version

How the periodic table was built and how it is arranged

Grade 10 Science Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

Mendeleev published his table in 1869, and gallium was found in 1875. How many years passed, Ari?
Mendeleev published his table in 1869, and germanium was found in 1886. How many years passed, Bo?

Read this first

predicted element	found as	year found	atomic mass (predicted / found)	density in g/cm³ (predicted / found)
eka-aluminium	gallium	1875	68 / 69.723	6.0 / 5.91
eka-boron	scandium	1879	44 / 44.956	not predicted
eka-silicon	germanium	1886	72 / 72.63	5.5 / 5.323

3.
Using the table, which element did Mendeleev call eka-silicon, Jun?
- Gallium
- Scandium
- Germanium
4.
Using the table, which predicted element was found first, Kira?
- Gallium, in 1875
- Scandium, in 1879
- Germanium, in 1886
5.
Using the table, how close was Mendeleev's mass for germanium, Luz?
- Close: 72 against 72.63
- Far off: 44 against 72.63
- Far off: 68 against 72.63
6.
How did Mendeleev arrange the elements in 1869, Milo?
- By mass, grouped by properties
- In alphabetical order
- By atomic number
7.
What did Mendeleev do when no known element fit a spot, Noah?
- Moved the pattern
- Left a gap for one
- Dropped the column
8.
When did Mendeleev publish his periodic table, Pia?
- 1869
- 1913
- 1808
9.
What do the elements in one group share, Tala?
- The same atomic number
- The same mass
- Similar properties
10.
How many groups does the modern periodic table have, Zee?
- 8
- 7
- 18

How the periodic table was built and how it is arranged. Every version has 10 questions, and the answer key prints on the second page.

I can tell the story: Döbereiner's triads (1829), Mendeleev's table (1869) and his gaps, and the 1875, 1879 and 1886 discoveries of gallium, scandium and germanium.
I can judge Mendeleev's predictions with percent difference.
I can explain that today's table is ordered by atomic number, with periods, groups and blocks.
I can read an element box and explain period lengths (2, 8, 8, 18, 18, 32, 32).

Standard: supports HS-PS1-1

period: A row of the periodic table

group: A column of elements with similar properties

triad: Döbereiner's set of three similar elements whose middle mass is about the average of the outer two

eka-: Mendeleev's prefix for a missing element one place below a known one

block: A region where one kind of subshell fills: s, p, d or f

Your child counted both end years. The time between two dates is the later year minus the earlier one.

Your child divided by the prediction. Compare with the measured value: |predicted − found| ÷ found × 100.

Your child added the two masses but didn't halve. An average of two values is their sum ÷ 2.

What is the most common mistake with how the periodic table was built and how it is arranged?

Your child counted both end years. The time between two dates is the later year minus the earlier one.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records