What mass of hydrogen peroxide (H2O2) must decompose to produce .77g of water?*Show all work!

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

Once similarity and one difference between a mixture of elements and a mixture of compounds

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.