Answer:
A
Explanation:
Argon has 17 protons and 18 neutron
atomic number is the same as the protons number.
<h2><u>Answer</u> :</h2>
The most appropriate option is :
Since, they are the most abundant elements found in Earth's Crust.
They are different in wavelength.
Simple dimensional analysis.
okay so youll need a periodic table to look up the molar mass. youll be given either an amount of grams or moles.