14. How do you describe an atom in which the number of protons is equal to the number of electrons?

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have