Answer:
boron
aluminum
gallium
indium
thallium
Explanation:
Any of these could work. Nitrogen has 5 valence electrons so you just needed to pick an element that has 3 valence electrons that nitrogen could borrow. This periodic table shows valence electron counts:
a) 500
b)-500, north west
a) sum of F= F1+F2= 200+300= 500
b) sum of forces=0
so 200+300-500+0
F1= 588 N
F2= 784 N
Please see the attached file.
<u>Explanation:</u>