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Virty [35]
3 years ago
9

An atom contains 31 protons,39neutrons and 31 electrons.Identify the mass number of this atom​

Chemistry
1 answer:
AlladinOne [14]3 years ago
5 0

Answer:

Atomic mass =70

Explanation:

Mass number is total protons +total neutrons

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The correct mass of a block is 28.0 grams. A chemist measures the block
Sati [7]

Answer:  NOT accurate, but precise.  

[translation:  You screwed up, but did it in style].

Explanation:

The average mass measurement is 41.95g.  Compared to the actual value of 28.0 grams, the measurement is NOT accurate.  

The standard deviation for the data is 0.112.  Dependiong on your definition of precision, this looks relatively good.  I would go for precise.  

3 0
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Hitman42 [59]
Condensation, is the process of a gas changing into a liquid.
5 0
4 years ago
Please help with this​
Mumz [18]

Answer:

4

Explanation:

Light refracts when it passes through something transparent at an angle so that eliminates the other 3.

or put differently

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8 0
4 years ago
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11111nata11111 [884]
The correct answer is B. Homeostasis
5 0
3 years ago
Which of the following is NOT true?
zepelin [54]

Answer:

it's answer 2

Explanation:

magnets can only move metal

7 0
2 years ago
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