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ioda
3 years ago
9

A certain atom has an atomic number of four. How many protons does it have?

Biology
2 answers:
Sliva [168]3 years ago
7 0

Answer:

The correct answer is D) 4

Explanation:

The atomic number of an element stands for its number of protons. It is the fingerprint of the element. If the atomic number is 4, the element has 4 protons. As you can see in the Periodic Table, the element with an atomic number of 4 is beryllium (Be).

sdas [7]3 years ago
6 0
I think its 4. try that.
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The speed of a nerve impulse in the human body is about 100 m/s. If you accidentally stub you toe in the dark, estimate the time
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Answer:

0.02 s takes the nerve impulse to travel to your brain.

Explanation:

We have an arythmetical equation that is proposed in the problem.

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After we have our equation formulated we need to find x

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This is the way how we found that there is a time of 0.02 s that takes the nerve impulse to go from the toe to your brain if you are 2 meters tall.

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2. The correct statements are:  

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