Question 6
A certain atom has 11 electrons, 8 neutrons, and a charge of -1. What is its atomic mass?
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NEED

Hey there!

The atomic mass is the sum of the protons and electrons.

The charge of an atom is the difference between protons and electrons.

So, the number of protons is p, and p - 11 = -1.

Add 11 to each side and get p = 10. The atom has 10 protons.

The atom has 10 protons and 8 neutrons, the sum of the two is the atomic mass.

10 + 8 = 18

The atom has an atomic mass of 18.

Hope this helps!  

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).