1: ribosomes
5: nucleus
11: vacuole
13: rough endoplasmic reticulum
10: chloroplasts
8: cellulose
12: chromosome
7: cell membrane
3: organelle
<span>Electronegativity is the property of an element that measures the
ability of it to attract and form electron bonds. The trend in the periodic
table in terms of electronegativity decreases from right to left and from top
to bottom. In the case of period 4, the element with the highest electronegativity
is bromine. </span>
Yes they can have origins in nature. A bunch of the elements on the periodic table are chemicals and this are basic substances and cannot be man made.
