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The element symbol for Mercuary should be capitalized like this: Hg It should be like that no matter how you have it in an equation.
Ignoring Matty's ignorance of the question asked...
According to Wikipedia "In former versions of the IUPAC recommendations, names were written with a capital initial letter. This practice has been abandoned in later publications.[3] The names of chemical compounds and chemical elements when written out, are common nouns in English, rather than proper nouns. They are capitalized at the beginning of a sentence or title, but not elsewhere. Note that for chemical elements this applies to the word only and not the chemical symbol, which is always capitalized. Both rules remain even with chemical elements derived from proper names which would otherwise be capitalized, in keeping with IUPAC policy to differentiate proper names from things named after proper names. Thus, it is californium but the symbol is Cf, and einsteinium, but symbol Es. Note that names for odd or rare chemicals are uncapitalized like common ones, and thus uranium and plutonium (symbols U and Pu) should be uncapitalized like carbon or iron (symbols C and Fe). This rule (full name uncapitalized but symbol capitalized) applies also to isotopes and nuclides, when completely written out: thus 14C but carbon-14. (The element Mercury is uncapitalized, but of course the planet and god Mercury remain capitalized proper nouns)."
So no, mercury isn't capitalized unless it refers to the planet or the god. Or Freddie Mercury, who is a god.
What else can I help you with?
Should the word chemistry be capitalized?
The word "chemistry" should be capitalized only when it is at the beginning of a sentence or part of a title.
Should the word magnetism be capitalized?
It should only be capitalized if it is the beginning of a sentence, if is part of a proper noun, or if it is a word in the title of a book, article, movie, story, etc.
Should the word equator be capitalized?
No, the word "equator" should not be capitalized unless it appears at the beginning of a sentence or as part of a proper noun (e.g., Equator Line Cafe).
Should the capitalized syllable be accented in this word zoology yes or no?
No. In the word "zoology," the second syllable is typically accented, not the capitalized one.
Should you capitalize Science teacher?
No, the word "science" is a common noun. Proper nouns are capitalized.
Should the word Will be capitalized?
The word 'will' should be capitalized only when it is a person's name or the first word in a sentence. As a verb or common noun, it should not be capitalized.
Should the word Sunday after a word be capitalized?
Yes, Sunday should always be capitalized.
Should second word in hyphenated phrase be capitalized?
The second word should not be capitalized
When should the word ext be capitalized?
As an abbreviation it should be capitalized.
Should the word smartphone be capitalized?
No, the word "smartphone" should not be capitalized unless it is at the beginning of a sentence.
Should the word epitaph be capitalized?
No, the word "epitaph" should not be capitalized unless it is at the beginning of a sentence or part of a title.
Should the word banker be capitalized?
The word "banker" should not be capitalized unless it is at the beginning of a sentence or part of a title.
Should the word greek be capitalized?
Yes, Greek should be capitalized.
Should the word Americans be capitalized?
Yes it should be capitalized.
Should the word 'noble' be capitalized?
No it shouldn't be capitalized.
Is the word mafia capitalized?
Yes it should be capitalized.
Should this word be capitalized Winter?
Yes Capitalized
