What kind of radioactive element is used fuel for dating an object? Half-Life

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?