[NicknamedBob]

The problem is you're looking at a slow eddy in the flow and wondering how all the pebbles got there.

The Solar System consists of about 99.99% Hydrogen, mostly in the Sun, and a few odd collections of the remaining debris, which has been selectively separated out like wheat from the chaff in much the same way.

The violent roiling and tossing of the primordial Earth gave ample opportunity for lighter elements to be "blown away" by the solar wind. Perhaps much of it was vacuumed up by Jupiter, which itself is another huge pool of Hydrogen, and small amounts of other stuff.

We didn't need millions of supernovae ... we really only needed one.

[Robert A Cook PE]

Certainly: Gaseous neon10 for example, should be much richer than it is on earth, but was was present been blown further out. Of course, that means even more fusion reactions must be added to the missing 10^40 that we can measure to account for the "missing" nuclei.

The lighter elements, particularly those matching the He4/2 (stable) sets, form the most common elements. I ignored (deliberately) the 99% of the universe that is H and He. Those (their mass ratios) are readily explained by the current theory: In fact, their very abundance is why the current theory appears strained by the "missing" sources for the 10^30 kilograms of elements that ARE present.

But, as Einstein pointed out when people criticized his theory of relativity, the correct theory must work for all observations, not just the 99% that fit the data.

[RadioAstronomer]

Actually or best estimate is 3.