An unknown element as 2 isotopes. X-72 is 46.33% abundant and X-78 is 53.67% abundant. What is average atomic mass? Please round to two decimal places aka round to the nearest hundredth. NO UNIT

PLS HELP ASAPP (TIMED)

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

Describe the properties of sodium, chlorine, and sodium chloride