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Calcium Element Symbol Ca

Ca is the chemical element symbol for calcium, atomic number 20. It is written with capital C and lowercase a.

Character
Ca
Unicode
U+0043 U+0061

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Periodic tablesChemical formulasLaboratory notesScientific databases

What Is the Calcium Element Symbol?

Ca identifies the element calcium in periodic tables and chemical formulas. Its atomic number is 20.

Periodic tables

Chemical formulas

Laboratory notes

Scientific databases

How to Type the Calcium Element Symbol

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Calcium Element Symbol on Windows

Copy Ca from this page or enter the complete sequence U+0043 U+0061 in a Unicode-aware editor.

Calcium Element Symbol on Mac

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Calcium Element Symbol on iPhone and iPad

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Calcium Element Symbol on Android

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Calcium Element Symbol on Chromebook

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Calcium Element Symbol on Microsoft Word

Paste Ca into Word or insert the component characters represented by U+0043 U+0061.

Calcium Element Symbol on Google Docs

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Calcium Element Symbol Unicode and HTML Codes

Use these values when you need the calcium element symbol in HTML, CSS, source code, or a character reference.

Unicode U+0043 U+0061
Unicode name LATIN CAPITAL LETTER C + LATIN SMALL LETTER A
HTML decimal C a
HTML hex C a
CSS escape 43 61

How to Use and Format the Calcium Element Symbol

Format Ca according to its role as Calcium Element Symbol. Ca is the chemical element symbol for calcium, atomic number 20. It is written with capital C and lowercase a. The encoded form is U+0043 U+0061; preserve the complete sequence, capitalization, subscripts, and superscripts exactly as shown.

This page covers Ca as the element symbol for calcium. It is not the abbreviation ca., the state code CA, or a calcium compound by itself. Add nearby readable wording when the notation appears outside a specialist chemistry context.

  • Write the element symbol exactly as Ca

  • Preserve uppercase and lowercase letters

  • Keep the complete sequence together when copying

  • Add subscripts or superscript charges only when the formula requires them

  • Define the element name for non-specialist readers

  • Use UTF-8 text or complete numeric references in HTML

  • Do not substitute a similar abbreviation or variable

  • Verify the encoded sequence is U+0043 U+0061

Calcium Element Symbol Examples

  • Ca
  • Ca²⁺
  • CaCO₃
  • CaCl₂
  • Calcium: Ca
  • Unicode sequence: U+0043 U+0061
  • HTML decimal: C a
  • HTML hexadecimal: C a
  • Accessible reading: Calcium Element Symbol
  • CSS escapes: 43 61

Common Calcium Element Symbol Mistakes

  • Changing the capitalization of Ca
  • Confusing the element symbol with a unit or variable that uses the same letters
  • Dropping a charge or subscript from a larger chemical formula
  • Treating a compound formula as the element symbol itself
  • Splitting the multi-letter symbol across formatting
  • Using an image when selectable text is more appropriate
  • Omitting a readable label where context is unclear
  • Assuming a lookalike sequence has the same chemical meaning

How this symbol differs

How Calcium Element Symbol differs

This page covers Ca as the element symbol for calcium. It is not the abbreviation ca., the state code CA, or a calcium compound by itself.

More About the Calcium Element Symbol

The chemical symbol for calcium is Ca. It is the element with atomic number 20, and its symbol must be written with a capital C followed by a lowercase a. In a periodic table, Ca alone identifies calcium; in a formula, the same two letters remain the calcium component of a larger expression.

Common examples show why the surrounding notation matters. Ca²⁺ represents a calcium ion with a two-plus charge. CaCO₃ is calcium carbonate, while CaCl₂ contains calcium and chlorine with a subscript two on chlorine. The extra letters, charges, and subscripts are not part of the base element symbol, but they must be preserved when the complete formula is copied.

Ca should not be confused with CA, the uppercase abbreviation used in other contexts, or with “ca.” as a prose abbreviation for approximately. It is also different from C, the element symbol for carbon. Chemistry capitalization is meaningful, so changing the second letter from lowercase to uppercase produces incorrect element notation.

As selectable text, Ca consists of U+0043 LATIN CAPITAL LETTER C and U+0061 LATIN SMALL LETTER A. The literal UTF-8 sequence is the clearest web form. HTML decimal references C a and hexadecimal references C a produce the same letters. Check the final font and capitalization after pasting.

Use a readable label such as “calcium” when Ca appears by itself in material intended for a general audience. A formula, table heading, or sentence should make clear that the text is chemical notation rather than an unrelated abbreviation.

Continue exploring: Strontium Symbol Sr , Sodium Symbol Na , Iron Element Symbol Fe and Gold Element Symbol Au . You can also browse all symbols.

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Calcium Element Symbol FAQ

What is the symbol for calcium?

The chemical element symbol is Ca, written with the capitalization shown.

What is the atomic number of calcium?

Its atomic number is 20.

What is the Unicode sequence for Ca?

The sequence is U+0043 U+0061: LATIN CAPITAL LETTER C + LATIN SMALL LETTER A.

How do I copy Ca?

Use the Copy button and paste the complete text Ca; verify that capitalization is unchanged.

Can I use Ca in HTML?

Yes. Use literal UTF-8 Ca, decimal references C a, or hexadecimal references C a.

Is Ca interchangeable with similar notation?

No. This page covers Ca as the element symbol for calcium. It is not the abbreviation ca., the state code CA, or a calcium compound by itself.