9) A pure sample of an element was vaporized and injected into a mass spectrometer and the data was plotted on the graph belovr. The mass values for the isotopes were
found to be: A-56 (55.935 amu), A-54 (53.940 amu), A-57 (56.935 amu), and A-58
(57.933 amu). Find the average atomic mass and identify the element.

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.