Write the symbol for every chemical element that has atomic number less than 16 and atomic mass greater than 24.0 u.

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As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3