Find that element! A chemistry worksheet for identifying elements based on their group, period, and symbol.

Let’s solve this step by step.

We are given a table with some information about elements — like their group/valence electrons, period/shells, symbol, name, and whether they are metal (M), nonmetal (NM), or metalloid (MD). We need to fill in the missing parts using what we know about the periodic table.

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Row 1:
- Period = 7, Symbol = Fr → That’s Francium.
- Group? Francium is in Group 1 (alkali metals).
- Element name: Francium
- M/NM/MD? It’s a metal → M

→ Fill: Group = 1, Element = Francium, M/NM/MD = M

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Row 2:
- Group = 2, Period = 3 → This is Magnesium (Mg)
- Symbol? Mg
- Element name: Magnesium
- M/NM/MD? Metal → M

→ Fill: Symbol = Mg, Element = Magnesium, M/NM/MD = M

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Row 3:
- Group = 7, Element = Bromine → Symbol is Br
- Period? Bromine is in Period 4
- M/NM/MD? Nonmetal → NM (already given)

→ Fill: Period = 4, Symbol = Br

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Row 4:
- Period = 5, Symbol = Sb → Antimony
- Group? Antimony is in Group 15 (or 5A) → so Group = 15
- Element name: Antimony
- M/NM/MD? Metalloid → MD

→ Fill: Group = 15, Element = Antimony, M/NM/MD = MD

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Row 5:
- Group = 3, Period = 4 → This is Scandium (Sc)
- Symbol? Sc
- Element name: Scandium
- M/NM/MD? Metal → M

→ Fill: Symbol = Sc, Element = Scandium, M/NM/MD = M

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Row 6:
- Group = 2, Element = Calcium → Symbol is Ca
- Period? Calcium is in Period 4
- M/NM/MD? Metal → M (already given)

→ Fill: Period = 4, Symbol = Ca

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Row 7:
- Group = 6, Symbol = O → Oxygen
- Period? Oxygen is in Period 2
- Element name: Oxygen
- M/NM/MD? Nonmetal → NM

→ Fill: Period = 2, Element = Oxygen, M/NM/MD = NM

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Row 8:
- Period = 6, Symbol = Tl → Thallium
- Group? Thallium is in Group 13
- Element name: Thallium
- M/NM/MD? Metal → M

→ Fill: Group = 13, Element = Thallium, M/NM/MD = M

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Row 9:
- Group = 4, Period = 3 → This is Silicon (Si)
- Symbol? Si
- Element name: Silicon
- M/NM/MD? Metalloid → MD

→ Fill: Symbol = Si, Element = Silicon, M/NM/MD = MD

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Row 10:
- Group = 6, Element = Polonium → Symbol is Po
- Period? Polonium is in Period 6
- M/NM/MD? Metalloid → MD (sometimes classified as metal, but often metalloid; since it's under oxygen/sulfur/seelenium/tellurium, and tellurium is metalloid, polonium is usually considered metalloid too)

Wait — actually, let’s double-check: Polonium is often classified as a metal, but many sources say metalloid. However, looking at common school classifications, especially if following the “staircase” on the periodic table, Polonium is sometimes listed as a metalloid. But to be safe — let’s check standard classification:

Actually, most modern sources classify Polonium as a metal because it has metallic properties. But in many textbooks for middle school, it might still be called a metalloid. Since the problem gives us flexibility, and row 4 had Sb as MD, and Po is below Te (which is MD), we’ll go with MD.

But wait — let me confirm: In many curricula, Polonium is treated as a metal. Hmm. Let’s look at context: The table already has “M”, “NM”, “MD”. For consistency, since Tellurium (above Po) is often MD, and Po is sometimes MD, but actually — I think for accuracy, Po is a metal.

Wait — no! Actually, according to IUPAC and most chemistry references, Polonium is a post-transition metal, so it should be M.

I made a mistake earlier. Let’s correct:

Polonium (Po) — atomic number 84 — is a metal. So M/NM/MD = M

Also, Period = 6 (given in row? Wait, row 10 says Group=6, Element=Polonium — we need to find Period and Symbol and M/NM/MD.

Symbol = Po

Period = 6 (since it’s in period 6)

M/NM/MD = M (metal)

→ Fill: Period = 6, Symbol = Po, M/NM/MD = M

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Row 11:
- Group = 1, Period = 5 → This is Rubidium (Rb)
- Symbol? Rb
- Element name: Rubidium
- M/NM/MD? Metal → M

→ Fill: Symbol = Rb, Element = Rubidium, M/NM/MD = M

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Row 12:
- Period = 5, Symbol = Xe → Xenon
- Group? Xenon is in Group 18 (noble gases)
- Element name: Xenon
- M/NM/MD? Nonmetal → NM

→ Fill: Group = 18, Element = Xenon, M/NM/MD = NM

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Now let’s compile all filled rows:

Original table with blanks filled:

| Group / Valence e⁻ | Period / Shells | Symbol | Element | M, NM, MD |
|--------------------|-----------------|--------|-------------|-----------|
| 1 | 7 | Fr | Francium | M |
| 2 | 3 | Mg | Magnesium | M |
| 7 | 4 | Br | Bromine | NM |
| 15 | 5 | Sb | Antimony | MD |
| 3 | 4 | Sc | Scandium | M |
| 2 | 4 | Ca | Calcium | M |
| 6 | 2 | O | Oxygen | NM |
| 13 | 6 | Tl | Thallium | M |
| 4 | 3 | Si | Silicon | MD |
| 6 | 6 | Po | Polonium | M |
| 1 | 5 | Rb | Rubidium | M |
| 18 | 5 | Xe | Xenon | NM |

Wait — Row 10: Group=6, Element=Polonium → we said Period=6, Symbol=Po, M/NM/MD=M

But in the original table, Row 10 has Group=6, Element=Polonium, and blank for Period, Symbol, M/NM/MD — yes.

And Row 12: Period=5, Symbol=Xe → Group=18, Element=Xenon, M/NM/MD=NM

All good.

Final Answer:

Here is the completed table:

Group / Valence e⁻ | Period / Shells | Symbol | Element | M, NM, MD
1 | 7 | Fr | Francium | M
2 | 3 | Mg | Magnesium | M
7 | 4 | Br | Bromine | NM
15 | 5 | Sb | Antimony | MD
3 | 4 | Sc | Scandium | M
2 | 4 | Ca | Calcium | M
6 | 2 | O | Oxygen | NM
13 | 6 | Tl | Thallium | M
4 | 3 | Si | Silicon | MD
6 | 6 | Po | Polonium | M
1 | 5 | Rb | Rubidium | M
18 | 5 | Xe | Xenon | NM