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Amiraneli [1.4K]
3 years ago
8

What does the number 18.9984 represent in the image?

Chemistry
1 answer:
Yanka [14]3 years ago
4 0

The element symbol in chemistry comprises atomic number and mass number.

Atomic number is written on the top of element and mass number is written at the bottom.

For eg:

If Y is an element that is having atomic number a and mass number x. Then its denotion will be:

ᵃYₓ.

So here ⁹F₁₈.₉₉

Here 18.99 will denote mass number while 9 will denote atomic number.

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Answer:

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The following is an example of what type of chemical reaction?
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ElenaW [278]

Answer:

Heat required = 13,325 calories or 55.75 KJ.

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4 0
3 years ago
A balloon, whose volume at 23°C is 535 mL, is heated to 46°C. Assuming the pressure and amount of gas remain constant, what is t
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