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How many significant figures are in the number 2100

Which is the correct nuclear symbol for an isotope of chlorine that contains 20 neutrons per atom?

Which substance(s) are ones unlikely to conduct in aqueous solution?  Select all appropriate choices (and note, more than 1 right answer is possible).

Which color in the visible region of the electromagnetic spectrum has the second largest range of wavelength?

Which of the following species is isoelectronic to Ar?3

Which subshell does not exist?

Name the following compound and spelling counts.  Type your answer if its a metal that exists with more than one charge, you must mention the charge of the cation’s magnitude in roman numerals in parentheses (e.g. 1 = (I), 2 = (II), etc.)   Formula is PbSO4

Which of the following best defines mental workload?

The frequency of an unknown wave of light is 7.25 x 1015 Hz.  What wavlength (in nm) is this light correspondance to?   NOTE: c =

Provide the chemical formula of the following substance.  Note, in the tool box above the textbox you must use the subscript notation as part of typing in the textbox your answer.  If not, no points will be awarded.  No partial credit for this problem.     PS when you click on the the circled item in the toolbox, select subscript for typing in numbers for the formula of this problem.   Name is diphosphorus pentoxide.