Answer:
The hardness is more than 2.5. Hope this helps.
Coefficient:
a. 2 9 8 10
b. 1 2 2 1
c. 1 1 2 1
Hope this helped:)
Protons and neutrons are located in the nucleus.
Electrons are located on the shells or orbitals the surround the nucleus.
A rule of thumb is that elements in the same column or "group" have similar chemical properties. Answer D. has four elements that are all in group 2, or the "alkaline earth metals". The answer is <span>D. 4, 20, 38, 88</span>
look the following picture i think that will help you too find out answer
