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D = m / V
0.775 = m / 50.0
m = 0.775 * 50.0
m = 38.75 g
Answer:
you can write plastic , paper , stone e.t.c
Explanation:
non metals means who are not being attracted by magnets
or
which does not have good conductor of heat and electricity
some others examples can be sulpher
The isotope notation : ⁷³₅₃X
<h3>Further explanation</h3>
Given
53 protons and 20 neutron
Required
The isotope notation
Solution
Isotopes are elements that have the same atomic number with a different mass number
The following element notation,

X = symbol of element
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
So the mass number of element = 53 + 20 = 73
Atomic number = 53
The symbol :

B, because all the other are elements. You can tell because Carbon and Oxygen in CO are both capitals while something like Au is gold.