Argon and nitrogen are usually filled in an electric bulb, so one is your answer.
Answer: 43.
Explanation:
Mass number is the sum of protons and neutrons of an atom.
The number of prortons is the atomic number, so you can write:
Mass number = atomic number + number of neutrons. From which you get;
number of neutrons = mass number - atomic number = 80 - 37 = 43
All the atoms of a given element have the same number of protons. That is why the number of protons idenfies the elements and is called atomic number.
The number of neutrons of a given element may be different for different atoms of the same element.
The atoms of an element that have different number of neutrons are called isotopes. So, different isotopes of the same element have same atomic number but different mass number.
C. Hydropower would need dams to be built, and this will prevent fishes from going upstream.
Answer:
The inner core is the Earth's "interior".
P-waves pass through both the mantle and core, but are slowed and refracted at the mantle / core boundary. Whereas, S-waves pass from the mantle to the core and are absorbed due to shear waves being incapable of transmitting through liquids. Therefore, this is (further) proof the outer core does not behave like a solid substance.
They reduce viral transmission (if worn correctly). ...
They prevent asymptomatic spread. ...
You're protecting others from illness. ...
They're mandated by law in some states. ...
They're good hygiene in general.
