(2 x 103 x 3 x 105) = 64890
2 x 10 -2 = 20 - 2 = 18
64890 / 18
3605
Or (206 x 315) / 20 - 2
2*a+5-(9*a-16)=0 witch equals <span> a=3</span>
Answer:


Step-by-step explanation:
Answer:

Step-by-step explanation:

The atomic number above the element is the number of protons inside of it.
That’s number 1 so answer is 169.
Number 2 is H because in the description above it states it is highly reactive