Which element has a complete valence electron shell?

Chemistry

2 answers:

borishaifa [10]3 years ago

7 0

Argon, it's a noble gas in the last group on the periodic table.

aliina [53]3 years ago

6 0

Argon is your answer

Hope this helps!

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How many moles of water are produced from 15 moles of oxygen?

Grace [21]

Answer:

30 moles

Explanation:

Water is H2O, meaning there is 2 Hydrogen atoms and 1 Oxygen atom. Oxygen is O2, because it is a diatomic molecule. (Hydrogen is also a diatomic molecule, so H2)

The equation, balanced, would have to be: 2H2 + O2 -----> 2H2O

I multiply 15 moles O2 by the molar ratio of (hydrogen/oxygen)

15 mol. O2 * (2 mol. H2/1 mol O2) = 30 moles of water

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Serhud [2]

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<h3>How to write an atomic symbol with atomic mass and atomic number?</h3>

Atomic mass is the total number of neutrons and protons present in the nucleus of an element.

The atomic number is the total number of protons present in the nucleus of an element.

For writing an atomic symbol, atomic mass is written on the top left of the atomic symbol, and the atomic number is written on the downside of the left of the symbol.

$^{Atomic mass}_{Atomic number}X$