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The best definition of isoelectronic elements is

How much energy is required to excite a hydrogen atom’s electron from n=2 to n=5? Enter your answer with 2 significant figures.

Write the predicted electron configuration (short version using the noblegas core) for the following atoms  Pt Leave 1 space between each term. For example Nitrogen would be entered: 2s2 2p3

Calculate the de Broglie wavelength of an electron with a velocity of 5.0 x 10 -3 times the speed of light (3.0 x 10 8 ms).

A sodium vapor lamp emits light with an average wavelength of 589.3 nm. Calculate the energy of a mole of photon of the light in j/mol

Write the expected short electron configuration for Hg. Leave 1 space in between each term. For example: nitrogen would be 2s2 2p3

A 35.0 g sample of nickel metal is heated to 100.°C and dropped into 100.0 g of water, initially at 22.0°C. Assuming that all of the heat lost by the nickel is absorbed by the water, calculate the final temperature of the nickel and the water. The specific heat of nickel is 0.444J/g°C)

The last valence electron in Br is 4p5. What are the quantum numbers for this electron. n is _______ l is  _______ ml is _______ and ms is _______

Calculate the energy of light emitted when the following transition occurs in a hydrogen atom: n=6 to n=3 Enter your value as a positive.