Read the water level with the correct number of significant figures.

One element that has 7 valence electrons is ________.   

Atomic emission spectra are due to electrons ________.

According to Hund’s Rule

Give the ground state electron configuration for Mg2⁺.   

Which reaction below represents the Ionization energy of Li?

Which of the following is NOT true for the atoms 13N, 14N, and 15N?

Calculate the energy of the orange light emitted, per photon, by a neon sign with a frequency of 4.89 × 1014 Hz. (E = h ν,Value of Planck’s constant h = 6.626 x 10-34 J.s and velocity of light c = 3.00 x 108 m/s) 

  The correct symbol for a uranium atom with a mass number of 235 is ________.

Compounds are pure substances that by definition consist of ________.