Answer:
One
Explanation:
Sodium (Na) has one valence electron so it gets one dot.
You're on K12 haha :0
I think it's the second answer choice but not sure. Sorry if I'm wrong
Answer:
c
Explanation:
catalysts are used up in a chemical reactiob
Lifespan is an indicator that measures the average of the maximum number of years a human can live.
<h3>What is lifespan?</h3>
It is the number of years that a newborn can live according to the standard of mortality by age of the population of its country.
In other words, it is a concept that only makes sense for one generation and is obtained as part of a mortality table that refers to the average number of years that a person is expected to live after birth.
Therefore, we can conclude that lifespan is an indicator that measures the average of the maximum number of years a human can live.
Learn more about lifespan here: brainly.com/question/11445304
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transfer of heat through electromagnetic waves
hope this helps
