11) A pure sample of an element was vaporized and injected into a mass spectrometer and the data was plotted on the graph below. The mass values for the isotopes
were found to be: A–64 (63.929 amu), A–66 (65.926 amu), A-68 (67.925 amu),
A-70 (69.925 amu), and A-67 (66.927 amu). Find the average atomic mass and
identify the element.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

i think its 100.

hope this !

the answers are

c and c