Answer:
I definitely think he mostly observed that it was clear in color.
Explanation:
Answer:
Drought, resulting in a 65% reduction in water levels.
Answer:
Physical Properties
Explanation:
You are able to see physical properties but are unable to see chemical properties.
Answer:
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Answer:
The period 4 alkaline-earth metal has the name Calcium. An isotope of this element having 20 neutrons has a mass number of 40.
Explanation:
Looking at the periodic table 4th row for the alkaline-earth metal, we can find Calcium which has an atomic number of 20 (or protons number, or z). The mass number is given by the sum of protons and neutrons. If the number of protons in this case is 20 and the number of neutrons is also 20, the mass number A = 40.
