Grade 10 · Science · Chemistry

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

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How the periodic table was built and how it is arranged

Grade 10 Science Worksheet - Challenge Me

NameDate

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

In Döbereiner's 1829 triads, lithium (6.94 u), sodium and potassium (39.098 u) form a group. What average of lithium and potassium predicts sodium's mass, to 0.01 u, Ari?
Chlorine (35.45 u), bromine and iodine (126.904 u) form a triad. What average of chlorine and iodine predicts bromine's mass, to 0.01 u, Bo?
Calcium (40.078 u), strontium and barium (137.327 u) form a triad. What average of calcium and barium predicts strontium's mass, to 0.1 u, Esme?
4.
In the same box, what does 55.845 show, Kira?
- The average atomic mass
- The number of neutrons inside
- The year it was found
5.
Why is iron's symbol Fe, Luz?
- From the name of its discoverer
- From its Latin name, ferrum
- From its color
6.
Milo says today's table is ordered by atomic mass. Agree or disagree?
- Disagree: by atomic number
- Agree: Mendeleev's order stayed
- Agree: heavier comes later
7.
Noah says argon must come after potassium because argon is heavier. Agree or disagree?
- Agree: the table is wrong
- Agree: atomic mass sets the order
- Disagree: argon has fewer protons
8.
Pia says Mendeleev's gaps were mistakes. Agree or disagree?
- Disagree: elements filled them
- Agree: they were removed
- Agree: gaps mean errors in his work
9.
How many elements are in period 2, Ren?
- 8
- 2
- 18
10.
How many elements are in period 6, Zee?
- 18
- 32
- 72

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.

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