How many moles is 1.8 x 1023 atoms of Be?

Idon’t know how to solve this question

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?

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!