What is a flame test used for? A. To remove impurities from a sample through burning
B. To identify an unknown sample by its emission spectrum
C. To identify an unknown sample by its melting point
D. To determine the ionization energies of electrons

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

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What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?