I got 134.91 but if you round it you’ll get 135
So for D you have to find energy right
from c you get wavelength Lambda
so on D use this
E = Hc / lambda
c is given 1.5 x 10 ^20
h = 6.624 x 10^-34
and then you get answer for energy
Answer:
Period
Explanation:
horizontal is a period and verticle is a group
<span> Substance 1 was activated by the heat and inactivated by ice, Substance 2 was activated by the change in concentration, and Substance 3 increased the surface area.</span>
<span>some elements would be Beryllium, Barium, Magnesium, and Strontium</span>