Which of the following is an element that is often used in fusion reactions? hydrogen lead plutonium uranium

Hydrogen

Explanation:

Hydrogen is often used in fusion reactions

4 ¹₁H  --> ⁴₂He +  2⁰₁e

Four hydrogen atoms undergo fusion reaction to form helium and 25 MeV( mega electron volt) of energy. Fusion reaction also occurs with isotopes of hydrogen such as deuterium and tritium.

²₁H + ²₁H  --> ⁴₂He

²₁H + ³₁H  --> ⁴₂He +  ¹₀n

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o