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Which of the following statements is TRUE? A) The principal quantum number (n) describes the shape of an orbital. B) The angular momentum quantum number (l) describes the size and energy associated with an orbital. C) The magnetic quantum number (ml) describes the orientation of the orbital. D) An orbital is the path that an electron follows during its movement in an atom. E) All of the above are true.

In which of the following sets do all species have the same number of electrons? A) Cl-, Ar, Ca2+ B) N, O2-, F- C) Sc3+, Y3+, La3+ D) Cr, Cr2+, Cr3+  

Which of the following statements about subatomic particles is TRUE? A) A neutral atom contains the same number of protons and electrons. B) Protons have about the same mass as electrons. C) Electrons make up most of the mass of an atom. D) Protons and neutrons have opposite but equal in magnitude, charges. E) Neutrons and electrons are found in the nucleus of an atom

On the electromagnetic spectrum, visible light is immediately between two other wavelengths. Name them. A) infrared and x-ray B) radio and microwave C) gamma-ray and ultraviolet D) microwave and x-ray E) infrared and ultraviolet

Calculate the mass (in mg) of 4.82 × 1022 atoms of sodium. A) 3.48 mg B) 287 × 103mg C) 287 mg D) 1.84 × 103mg E) 1.84 mg

When waves of equal amplitude from two sources are out of phase when they interact, it is called A) destructive interference. B) diffraction. C) constructive interference. D) effusion. E) amplitude

Place the following in order of increasing radius.             Br⁻             Na⁺            Rb⁺ A) Br⁻ < Rb⁺ < Na⁺ B) Na⁺ < Rb⁺ < Br⁻ C) Rb⁺ < Br⁻ < Na⁺ D) Br⁻ < Na⁺ < Rb⁺ E) Rb⁺ < Na⁺ < Br⁻

Predict the charge that a Ga (Gallium) ion would have. A) 5- B) 1+ C) 1- D) 2+ E) 3+

Which of the following is NOT a method used here to operate a heating device?

What is wrong with the security of the door on this enclosure?  Please be specific.